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1. 1:1,000,000-Scale Combined Statistical Areas, 2013

2013. National Atlas of the United States. This polygon shapefile contains combined statistical areas in the United States and Puerto Rico. Combined statistical areas consist of two or more ... National Atlas of the United States.

2. 1:1,000,000-Scale Core Based Statistical Areas, 2013

2013. National Atlas of the United States. This polygon shapefile contains core based statistical areas in the United States and Puerto Rico. The map layer was created from the CENSUS 2010 T... National Atlas of the United States.

3. 1:1,000,000-Scale County Boundaries of the United States, 2014

2014. Geological Survey (U.S.). This polygon shapefile contains the county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands, by showing the counties as ar... Geological Survey (U.S.).

4. 1:1,000,000-Scale National Boundaries of the United States, 2014

2014. Geological Survey (U.S.). This polygon shapefile contains the boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer was created by extract... Geological Survey (U.S.).

5. 1:1,000,000-Scale National Wilderness Preservation System of the United States, 2014

2014. National Atlas of the United States. This polygon shapefile consists of National Wilderness Preservation System areas of 320 acres or more, in the United States, Puerto Rico, and the U... National Atlas of the United States.

6. 1:1,000,000-Scale State Boundaries of the United States, 2012

2012. National Atlas of the United States. This polygon shapefile portrays the state boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer was created by e... National Atlas of the United States.

7. 1:1,000,000-Scale State Boundaries of the United States, 2014

2014. National Atlas of the United States. This polygon shapefile portrays the state boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer was created by e... National Atlas of the United States.

8. 1:1,000,000-Scale Waterbodies and Wetlands of the United States, 2014

2014. Geological Survey (U.S.). This polygon shapefile represents waterbodies and wetlands of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer was produc... Geological Survey (U.S.).

9. ACS 5 Year CHAS Data by County, 2008-2012

2008. United States. Department of Housing and Urban Development. This polygon shapefile contains Comprehensive Housing Affordability Strategy (CHAS) data at the county level. The CHAS is derived from the American... United States. Department of Housing and Urban Development.

10. ACS 5 Year CHAS Data by Place, 2008-2012

United States. Department of Housing and Urban Development. This polygon shapefile contains Comprehensive Housing Affordability Strategy (CHAS) data at the place level. The CHAS is derived from the American ... United States. Department of Housing and Urban Development.

11. ACS 5 Year CHAS Data by State, 2008-2012

United States. Department of Housing and Urban Development. This polygon shapefile contains Comprehensive Housing Affordability Strategy (CHAS) data at the state level. The CHAS is derived from the American ... United States. Department of Housing and Urban Development.

12. ACS 5 Year CHAS Data by Summary Level 080, 2008-2012

2008. United States. Department of Housing and Urban Development. This polygon shapefile contains Comprehensive Housing Affordability Strategy (CHAS) data at the geographic summary level 080 (State - County - Coun... United States. Department of Housing and Urban Development.

13. ACS 5 Year Demographic Data by Place, 2008-2012

2008. United States. Department of Housing and Urban Development. This polygon shapefile contains 5-year American Community Survey (ACS) estimates of demographic variables at the place level. The TIGER/Line Files ... United States. Department of Housing and Urban Development.

14. ACS 5 Year Demographic Data by State, 2007-2011

2007. United States. Department of Housing and Urban Development. This polygon shapefile contains 5-year American Community Survey (ACS) estimates of demographic variables at the state level. The TIGER/Line Files ... United States. Department of Housing and Urban Development.

15. ACS 5 Year Demographic Data by Tract, 2008-2012

United States. Department of Housing and Urban Development. This polygon shapefile contains 5-year American Community Survey (ACS) estimates of demographic variables at the tract level. The TIGER/Line Files ... United States. Department of Housing and Urban Development.

16. ACS 5 Year Housing Data by County, 2008-2012

2008. United States. Department of Housing and Urban Development. 5-year American Community Survey estimates of housing variables (see below) at the county level released in 2012. The TIGER/Line Files are shapefil... United States. Department of Housing and Urban Development.

17. ACS 5 Year Housing Data by Place, 2008-2012

2008. United States. Department of Housing and Urban Development. This polygon shapefile contains 5-year American Community Survey estimates of housing variables (see below) at the place level released in 2012. Th... United States. Department of Housing and Urban Development.

18. ACS 5 Year Housing Data by State, 2008-2012

2008. United States. Department of Housing and Urban Development. 5-year American Community Survey estimates of housing variables (see below) at the state level released in 2012. The TIGER/Line Files are shapefile... United States. Department of Housing and Urban Development.

19. ACS 5 Year Housing Data by Tract, 2008-2012

2008. United States. Department of Housing and Urban Development. 5-year American Community Survey estimates of housing variables (see below) at the tract level released in 2012. The TIGER/Line Files are shapefile... United States. Department of Housing and Urban Development.

20. ACS 5 Year Socioeconomic Data by County, 2008-2012

2008. United States. Department of Housing and Urban Development. 5-year American Community Survey estimates of socioeconomic variables (see below) at the county level released in 2012. The TIGER/Line Files are sh... United States. Department of Housing and Urban Development.

21. ACS 5 Year Socioeconomic Data By Place, 2008-2012

2008. United States. Department of Housing and Urban Development. 5-year American Community Survey estimates of socioeconomic variables (see below) at the place level released in 2012. The TIGER/Line Files are sha... United States. Department of Housing and Urban Development.

22. ACS 5 Year Socioeconomic Data by State, 2008-2012

United States. Department of Housing and Urban Development. 5-year American Community Survey estimates of socioeconomic variables (see below) at the state level released in 2012. The TIGER/Line Files are sha... United States. Department of Housing and Urban Development.

23. ACS 5 Year Socioeconomic Data By Tract, 2008-2012

2008. United States. Department of Housing and Urban Development. 5-year American Community Survey estimates of socioeconomic variables at the tract level released in 2012. The TIGER/Line Files are shapefiles and ... United States. Department of Housing and Urban Development.

24. Administrative Boundaries of National Park System Units, 2011

2011. United States. Bureau of Transportation Statistics. This polygon shapefile depicts service wide boundary set for display and general analysis purposes. This layer is part of the 2014 National Transpo... United States. Bureau of Transportation Statistics.

25. Administrative County Boundaries: United States and Territories, 2011

2011. United States. Bureau of the Census. Geography Division and United States. Bureau of Transportation Statistics. This polygon shapefile contains United States administrative county boundaries extracted from the U.S. Census Bureau's MAF/TIGER Database (MTDB). T... United States. Bureau of Transportation Statistics.

26. Agriculture Census of the United States, 2002

2002. National Atlas of the United States. This polygon shapefile portrays a selected set of information that was collected for the 2002 Census of Agriculture by the National Agricultural St... National Atlas of the United States.

27. Agriculture Census of the United States, 2007

2007. National Atlas of the United States. This polygon shapefile portrays a selected set of information that was collected for the 2007 Census of Agriculture by the National Agricultural St... National Atlas of the United States.

28. Areas and Facies Types of Metamorphism: Geology of the Conterminous United States, 2005

2005. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This line shapefile shows the outlines of major calderas and impact structures in the United States. This layer is part of the Geologic Map of the ... Geological Survey (U.S.).

29. Bailey's Ecoregions and Subregions of the United States, 2004

2004. United States. Forest Service. This polygon shapefile is commonly called Bailey's ecoregions and shows ecosystems of regional extent in the United States, Puerto Rico, and the U.... National Atlas of the United States.

30. Boundary, United States, 2015

Hijmans, Robert J. and University of California, Berkeley. Museum of Vertebrate Zoology. This polygon shapefile contains the boundary of United States (adm0). This layer is part of the Global Administrative Areas 2015 (v2.8) dataset. University of California, Berkeley. Museum of Vertebrate Zoology.

31. CDBG Activity by Tract, 1996-2016

1996. United States. Department of Housing and Urban Development. The Community Development Block Grant (CDBG) is a federal block grant distributed via formula to states and local governments. States and local gov... United States. Department of Housing and Urban Development.

32. CDBG Grantee Areas, 2016

2016. United States. Department of Housing and Urban Development. This polygon shapefile represents the boundaries of Community Development Block Grant (CDBG) Entitlement Communities and State Administered CDBG gr... United States. Department of Housing and Urban Development.

33. Challenge Grantee Areas, 2014

2014. United States. Department of Housing and Urban Development. This polygon shapefile represents the boundaries of HUDs Community Challenge Grantee communities. These grants aim to reform and reduce barriers to... United States. Department of Housing and Urban Development.

34. Choice Grantees, 2016

2016. United States. Department of Housing and Urban Development. This polygon shapefile represents the boundaries of Choice grantee recipients as of April 2016. The Seattle Housing Authority was awarded two imple... United States. Department of Housing and Urban Development.

35. Coal Fields of the United States

2001. Eastern Energy Resource Surveys Team (Geological Survey). This polygon shapefile shows the coal fields of Alaska and the conterminous United States. Most of the material for the conterminous United States ... National Atlas of the United States.

36. CoC Grantee Areas, 2014

2014. United States. Department of Housing and Urban Development. This polygon shapefile represents the boundaries of Continuum of Care (CoC) grantee recipients as of November 14, 2014. Homeless Assistance Program... United States. Department of Housing and Urban Development.

37. Congressional Districts: United States and Territories, 2013-2015

2013. United States. Bureau of Transportation Statistics and Rawson, Peg. This polygon shapefile contains United States congressional district boundaries for 2013-2015. Congressional Districts are the 435 areas from which... United States. Bureau of Transportation Statistics.

38. Costly Regional Landslide Events in the United States

2001. Godt, Jonathan W. This polygon shapefile contains information on costly regional landslide events in the 50 United States and Puerto Rico. The extents of the regiona... National Atlas of the United States.

39. County Boundaries of the United States, 1980

1980. Geological Survey (U.S.). This polygon shapefile contains the 1980 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).

40. County Boundaries of the United States, 1990

1990. Geological Survey (U.S.). This polygon shapefile portrays the 1990 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).

41. County Boundaries of the United States, 2000

2000. Geological Survey (U.S.). This polygon shapefile portrays the 2000 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).

42. County Boundaries with Politicial Limit: United States and Territories, 2014

2014. United States. Bureau of Transportation Statistics. This polygon shapefile contains United States county boundaries with political limits extracted from the U.S. Census Bureau's MAF/TIGER Database (M... United States. Bureau of Transportation Statistics.

43. Current Distributions of Selected Amphibians in the United States, 1941-2000

1941. Lannoo, Michael J., Blackburn, Laura, and Nanjappa, Priya. This polygon shapefile portrays the distribution of 10 selected amphibians in the United States, based on historical literature and museum records ... National Atlas of the United States.

44. Difficult Development Areas, 2013

2013. United States. Department of Housing and Urban Development. A Difficult Development Area (DDA) for the Low Income Housing Tax Credit program is an area designated by U.S. Department of Housing and Urban Deve... United States. Department of Housing and Urban Development.

45. Easements, Protected Areas Database of the United States, 2005-2016

2005. Gap Analysis Program (U.S.). This polygon shapefile contains combined PAD-US Easements features for the United States. The USGS Protected Areas Database of the United States (P... Gap Analysis Program (U.S.).

46. Empowerment Zones Renewal and Enterprise Communities, 2014

2014. United States. Department of Housing and Urban Development. Introduced in 1993, the Empowerment Zone (EZ), Enterprise Community (EC), and Renewal Community (RC) Initiatives sought to reduce unemployment and ... United States. Department of Housing and Urban Development.

47. Engineering Aspects of Karst

1984. Tobin, B. D. and Weary, David J. This polygon shapefile is a digital version of U.S. Geological Survey Open File Report 2004-1352, Engineering Aspects of Karst. The open-file repor... National Atlas of the United States.

48. Environmental Health Hazard Index, 2015

2015. United States. Department of Housing and Urban Development. The environmental health hazard exposure index summarizes potential exposure to harmful toxins at a neighborhood level. Potential health hazards ex... United States. Department of Housing and Urban Development.

49. ESG Grantee Areas, 2016

2016. United States. Department of Housing and Urban Development. The Emergency Solutions Grants (ESG), formally the Emergency Shelter Grants, program is designed to identify sheltered and unsheltered homeless per... United States. Department of Housing and Urban Development.

50. Fair Market Rents, 2016

2016. United States. Department of Housing and Urban Development. Fair Market Rents (FMRs) are primarily used to determine payment standard amounts for the Housing Choice Voucher program. FMRs are also used to det... United States. Department of Housing and Urban Development.

51. Federal Lands of the United States, 2006

1972. National Atlas of the United States. This polygon shapefile contains federally owned or administered lands of the United States, Puerto Rico, and the U.S. Virgin Islands. Only areas of... National Atlas of the United States.

52. Fees and Easements, Protected Areas Database of the United States, 2005-2016

2005. Gap Analysis Program (U.S.). This polygon shapefile contains combined PAD-US Fee and Easements features for the United States. The USGS Protected Areas Database of the United S... Gap Analysis Program (U.S.).

53. Fees, Protected Areas Database of the United States, 2005-2016

2005. Gap Analysis Program (U.S.). This polygon shapefile contains PAD-US Fees features for the United States. The USGS Protected Areas Database of the United States (PAD-US) is the ... Gap Analysis Program (U.S.).

54. FHA Insurance in Force by Tract, 2016

2016. United States. Department of Housing and Urban Development. The Federal Housing Administration, generally known as "FHA", provides mortgage insurance on loans made by FHA-approved lenders throughout the Unit... United States. Department of Housing and Urban Development.

55. FHA Insurance in Force by Tract, 2016

2016. United States. Department of Housing and Urban Development. The Federal Housing Administration, generally known as "FHA", provides mortgage insurance on loans made by FHA-approved lenders throughout the Unit... United States. Department of Housing and Urban Development.

56. First-level Administrative Divisions, United States, 2015

Hijmans, Robert J. and University of California, Berkeley. Museum of Vertebrate Zoology. This polygon shapefile contains the first-level administrative divisions of United States (adm1). Level 1 divisions include states and federal dist... University of California, Berkeley. Museum of Vertebrate Zoology.

57. Freight Analysis Framework Regions: United States and Territories, 2013

2013. Strocko, Ed and United States. Bureau of Transportation Statistics. This polygon shapefile contains United States freight analysis framework (FAF) regions. FAF domestic region level datasets and products provide inf... United States. Bureau of Transportation Statistics.

58. Geologic Units (Polygons): Geology of the Conterminous United States, 2005

1994. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This polygon shapefile shows the boundaries of geologic units within the United States. This layer is part of the Geologic Map of the United States... Geological Survey (U.S.).

59. Global Map: 1:1,000,000-Scale Inland Water Areas of the United States, 2014

2014. Geological Survey (U.S.). This polygon shapefile includes Global Map data showing waterbodies and wetlands of the United States, Puerto Rico, and the U.S. Virgin Islands. Th... Geological Survey (U.S.).

60. Global Map: 1:1,000,000-Scale Political Areas of the United States, 2014

2014. National Atlas of the United States. This polygon shapefile includes Global Map data showing the counties and equivalent entities of the United States, Puerto Rico, and the U.S. Virgin... National Atlas of the United States.

61. Hazardous Waste, Generated, Shipped, Received 2001-2007

2001. National Atlas of the United States. This polygon shapefile portrays the hazardous waste generated, shipped, and received by state and other areas within the United States, Puerto Rico... National Atlas of the United States.

62. HOME Activity by Tract, 2016

2016. United States. Department of Housing and Urban Development. This polygon shapefile contains Home Investment Partnerships Program (HOME) activity data at the tract level. HOME is a program of federal block gr... United States. Department of Housing and Urban Development.

63. HOME Grantee Areas, 2016

2016. United States. Department of Housing and Urban Development. This polygon shapefile represents the boundaries of HOME Investment Partnership Program (HOME) grantee areas. HOME is authorized under Title II of ... United States. Department of Housing and Urban Development.

64. Homeownership Centers, 2012

2012. United States. Department of Housing and Urban Development. This polygon shapefile represents the boundaries of HUD Homeownership Centers (HOCs). HOCs insure single family Federal Housing Administration (FHA... United States. Department of Housing and Urban Development.

65. Homeownership Centers by State, 2012

2012. United States. Department of Housing and Urban Development. This polygon shapefile contains information on HUD Homeownership Centers (HOCs) at the state boundary level. HOCs insure single family Federal Hous... United States. Department of Housing and Urban Development.

66. HOPWA Grantee Areas, 2016

2016. United States. Department of Housing and Urban Development. The Housing Opportunities for Persons with AIDS (HOPWA) program funds are distributed to states and cities by formula allocations and made availabl... United States. Department of Housing and Urban Development.

67. Housing Choice Vouchers by Tract, 2016

2016. United States. Department of Housing and Urban Development. The U.S. Department of Housing and Urban Developments (HUD) Housing Choice Voucher Program (HCVP) is the federal government's major program for ass... United States. Department of Housing and Urban Development.

68. HUD Regions, 2012

2012. United States. Department of Housing and Urban Development. The United States Department of Housing and Urban Development (HUD) is organized into 10 Regions where each Region is managed by a Regional Adminis... United States. Department of Housing and Urban Development.

69. Hurricane Sandy Damage Estimates by Block Group, 2012

2012. United States. Department of Housing and Urban Development. A FEMA housing inspection for renters is used to assess personal property loss and for owners to assess damage to their home as well as personal pr... United States. Department of Housing and Urban Development.

70. Hydrographic Features (Polygons): United States and Territories, 2011

2011. United States. Bureau of the Census. Geography Division and United States. Bureau of Transportation Statistics. This polygon shapefile depicts hydrography coverages that were created using TIGER/Line 2000 shapefile data gathered from ESRI's Geography Network.... United States. Bureau of Transportation Statistics.

71. Hydrography, North America, 2004

2004. Instituto Nacional de Estadística, Geografía e Informática (Mexico), Geological Survey (U.S.), and Canada Centre for Remote Sensing. This polygon shapefile shows areas of coastline, and other hydrographic features in North America. This data set was produced using digital files s... Geological Survey (U.S.).

72. Indian Lands of the United States, 2006

2006. National Atlas of the United States. This polygon shapefile shows Indian lands of the United States. Only areas of 640 acres or more are included. Federally-administered lands within a... National Atlas of the United States.

73. Landslide Incidence and Susceptibility in the Conterminous United States

2001. Geological Survey (U.S.) and Godt, Jonathan W. These polygon shapefile is a digital version of U.S. Geological Survey Professional Paper 1183, Landslide Overview Map of the Conterminous United S... National Atlas of the United States.

74. LED for CDBG Grantee Areas, 2016

2016. United States. Department of Housing and Urban Development. The U.S. Census Bureau, Center for Economic Studies, annual Local Employment Dynamics (LED) database provides a summary of job and worker counts an... United States. Department of Housing and Urban Development.

75. LED for CoC Grantee Areas, 2015

2016. United States. Department of Housing and Urban Development. The U.S. Census Bureau, Center for Economic Studies, annual Local Employment Dynamics (LED) database provides a summary of job and worker counts an... United States. Department of Housing and Urban Development.

76. LED for ESG Grantee Areas, 2016

2016. United States. Department of Housing and Urban Development. The U.S. Census Bureau, Center for Economic Studies, annual Local Employment Dynamics (LED) database provides a summary of job and worker counts an... United States. Department of Housing and Urban Development.

77. LED for HOME Grantee Areas, 2016

2016. United States. Department of Housing and Urban Development. The U.S. Census Bureau, Center for Economic Studies, annual Local Employment Dynamics (LED) database provides a summary of job and worker counts an... United States. Department of Housing and Urban Development.

78. LED for HOPWA Grantee Areas, 2016

2016. United States. Department of Housing and Urban Development. The U.S. Census Bureau, Center for Economic Studies, annual Local Employment Dynamics (LED) database provides a summary of job and worker counts an... United States. Department of Housing and Urban Development.

79. LED for UGLG Grantee Areas, 2016

2016. United States. Department of Housing and Urban Development. The U.S. Census Bureau, Center for Economic Studies, annual Local Employment Dynamics (LED) database provides a summary of job and worker counts an... United States. Department of Housing and Urban Development.

80. Level III Ecoregions, Arizona, 2013

2013. US Environmental Protection Agency. Ecoregions denote areas of general similarity in ecosystems and in the type, quality, and quantity of environmental resources. They are designed to... U.S. EPA Office of Research & Development (ORD) - National Health and Environmental Effects Research Laboratory (NHEERL).

81. Level IV Ecoregions, Arizona, 2013

2013. US Environmental Protection Agency. Ecoregions by state were extracted from the seamless national shapefile. Ecoregions denote areas of general similarity in ecosystems and in the typ... U.S. EPA Office of Research and Development (ORD) - National Health and Environmental Effects Research Laboratory (NHEERL).

82. Low Transportation Cost Index, 2008-2012

2008. United States. Department of Housing and Urban Development. This index is based on estimates of transportation costs for a family that meets the following description: a 3-person single-parent family with in... United States. Department of Housing and Urban Development.

83. Mapping Interstate Territorial Conflict, 1947-2000

1947. Schultz, Kenneth A. This polygon shapefile represents areas that were the subject of interstate territorial disputes between 1947 and 2000. The disputed areas referenc... Stanford Digital Repository.

84. Metropolitan and Micropolitan Statistical Areas: United States and Territories, 2013

2013. United States. Bureau of the Census. Geography Division and United States. Bureau of Transportation Statistics. This polygon shapefile contains areas of metroplitan and micropolitan statistics extracted from the United States Census MAF/TIGER Database (MTDB).... United States. Bureau of Transportation Statistics.

85. Metropolitan Planning Boundaries: United States and Territories, 2011

2011. United States. Federal Highway Administration and United States. Bureau of Transportation Statistics. This polygon shapefile contains United States metropolitan planning boundaries. The United States Metropolitan Planning Organization (MPO) Database... United States. Bureau of Transportation Statistics.

86. Military Installations: United States and Territories, 2011

2011. United States. Office of the Deputy Under Secretary of Defense (Installations and Environment) and United States. Bureau of Transportation Statistics. This polygon shapefile depicts sites that were selected from the 2010 Base Structure Report (BSR), a summary of the DoD Real Property Inventory (RP... United States. Bureau of Transportation Statistics.

87. National Fire Plan - Hazardous Fuels Reduction Program, 2004

2004. National Atlas of the United States. This polygon shapefile portrays county level data for the fiscal-year-2004 National Fire Plan - Hazardous Fuels Reduction Program. The purpose of t... National Atlas of the United States.

88. National Wilderness Preservation System of the United States, 2006

1972. National Atlas of the United States. This polygon shapefile contains National Wilderness Preservation System areas of 640 acres or more, in the United States, Puerto Rico, and the U.S.... National Atlas of the United States.

89. Nonattainment Areas for Carbon Monoxide Pollution: United States and Territories, 1971

1971. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the carbon mono... United States. Bureau of Transportation Statistics.

90. Nonattainment Areas for Carbon Monoxide Pollution: United States and Territories, 1990

1990. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the carbon mono... United States. Bureau of Transportation Statistics.

91. Nonattainment Areas for Lead Pollution: United States and Territories, 1978

1978. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the lead (Pb) 3... United States. Bureau of Transportation Statistics.

92. Nonattainment Areas for Lead Pollution: United States and Territories, 2008

2008. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the lead (Pb) 3... United States. Bureau of Transportation Statistics.

93. Nonattainment Areas for Nitrogen Dioxide Pollution: United States and Territories, 1971

1971. Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the nitrogen di... United States. Bureau of Transportation Statistics.

94. Nonattainment Areas for Nitrogen Dioxide Pollution: United States and Territories, 1990

1990. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the nitrogen di... United States. Bureau of Transportation Statistics.

95. Nonattainment Areas for Ozone Pollution: United States and Territories, 1979

1979. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the ozone (O3) ... United States. Bureau of Transportation Statistics.

96. Nonattainment Areas for Ozone Pollution: United States and Territories, 1990

1990. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the ozone (O3)1... United States. Bureau of Transportation Statistics.

97. Nonattainment Areas for Ozone Pollution: United States and Territories, 1997

1997. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the ozone (O3) ... United States. Bureau of Transportation Statistics.

98. Nonattainment Areas for Ozone Pollution: United States and Territories, 2008

2008. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the ozone (O3) ... United States. Bureau of Transportation Statistics.

99. Nonattainment Areas for Patriculate Matter Pollution: United States and Territories, 1987

1987. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the particulate... United States. Bureau of Transportation Statistics.

100. Nonattainment Areas for Patriculate Matter Pollution: United States and Territories, 1990

1990. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the particulate... United States. Bureau of Transportation Statistics.