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1. Offshore Border: United States and Mexico, 2004

2004. California. Department of Fish and Game. Marine Resources Region. This line shapefile represents the offshore boundary between the United States and Mexico. This layer is part of a collection of data created by th... California. Department of Fish and Game. Marine Resources Region.

2. United States Census Urbanized Areas, 2010

2013. U.S. Census Bureau. Geography Division and Environmental Systems Research Institute (Redlands, Calif.). This polygon shapefile represents the 2010 Census urban areas in the United States. An urban area comprises a densely settled core of census tracts... Environmental Systems Research Institute (Redlands, Calif.).

3. United States National Atlas Federal and Indian Land Areas, 1972-2004

1972. National Atlas of the United States, Environmental Systems Research Institute (Redlands, Calif.), and Geological Survey (U.S.). This polygon shapefile represents the federal and Indian-owned land areas (for example, Bureau of Indian Affairs, Department of Defense, and Tennes... Environmental Systems Research Institute (Redlands, Calif.).

4. United States National Atlas Urbanized Areas, 2001

2001. National Atlas of the United States, Environmental Systems Research Institute (Redlands, Calif.), and Geological Survey (U.S.). This polygon shapefile represents urban areas in the United States derived from the urban areas layer of the Digital Chart of the World (DCW). Data... Environmental Systems Research Institute (Redlands, Calif.).

5. U.S. Counties (Generalized)

2002. Esri. U.S. Counties (Generalized) represents the counties of the United States in the 50 states and the District of Columbia. Esri.

6. 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.).

7. 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.).

8. 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.).

9. 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.).

10. 1:1,000,000-Scale County Boundary Lines 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. This layer was derived from t... Geological Survey (U.S.).

11. 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.).

12. 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.).

13. 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.).

14. 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.).

15. Official Protraction Diagram and Leasing Map Boundaries, United States, 2001

2001. United States. Minerals Management Service. This polygon shapefile shows the official protraction diagram (OPD) and leasing map boundaries for the United States, covering areas of the Outer C... Geological Survey (U.S.).

16. Political Boundaries, 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 depicts the political boundaries of North America, including: international boundaries, provincial boundaries, state or terr... Geological Survey (U.S.).

17. Political Boundary Lines, North America, 2004

2004. Instituto Nacional de Estadística, Geografía e Informática (Mexico), Geological Survey (U.S.), and Canada Centre for Remote Sensing. This line shapefile depicts the political boundaries of North America, including: international boundaries, provincial boundaries, state or territo... Geological Survey (U.S.).

18. State Boundaries of the United States, 2005

1972. Geological Survey (U.S.). This polygon shapefile portrays the state boundaries of the United States, and the boundaries of Puerto Rico and the U.S. Virgin Islands. The map l... Geological Survey (U.S.).

19. 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.

20. 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.

21. 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.

22. 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.

23. 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.

24. Global Map: 1:1,000,000-Scale Political Boundary Lines of the United States, 2014

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

25. 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.

26. 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.

27. Time Zones of the United States, 2005

1972. National Atlas of the United States. This polygon shapefile portrays the time zones of the United States, Puerto Rico, and the U.S. Virgin Islands. Also included are the Greenwich Mean... National Atlas of the United States.

28. U.S. Marine Protected Area Boundaries: MPA Inventory, 2010

2010. United States. Office of Ocean and Coastal Resource Management, National Marine Protected Areas Center (U.S.), United States. Department of Commerce, and United States. National Oceanic and Atmospheric Administration. This polygon shapefile represents the Marine Protected Areas inventory as of March 2010. The MPA Inventory is a comprehensive geospatial database t... National Marine Protected Areas Center (U.S.).

29. U.S. Marine Protected Areas Boundaries: MPA Inventory, 2014

2014. Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), Office Of National Marine Sanctuaries (ONMS), National Marine Protected Areas Center (MPAC), United States. Office of Ocean and Coastal Resource Management, United States. National Oceanic and Atmospheric Administration, and National Marine Protected Areas Center (U.S.). This polygon shapefile represents the Marine Protected Areas inventory as of October 2014. The MPA Inventory is a comprehensive catalog that provid... National Marine Protected Areas Center (U.S.).

30. State and Province Areas, 1:50 million (2012)

2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This polygon shape file depicts internal, first-order administrative boundaries for states and provinces of Australia, Brazil, Canada and the Unite... North American Cartographic Information Society.

31. State and Province Boundaries, 1:50 million (2012)

2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This polyline shape file depicts internal, first-order administrative boundaries and polygons for states and provinces of Australia, Brazil, Canada... North American Cartographic Information Society.

32. State and Province Boundaries with Large Lakes, 1:50 million (2012)

2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This polygon shapefile depicts internal, first-order administrative boundaries and polygons with large lakes for all but a few tiny countries. Incl... North American Cartographic Information Society.

33. States and Provinces with Scale Ranking, 1:50 million (2012)

2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This polygon shape file depicts internal, first-order administrative boundaries for states and provinces of Australia, Brazil, Canada and the Unite... North American Cartographic Information Society.

34. U.S. Parks and Protected Land Areas, 1:10 million (2012)

0. Patterson, Tom and Kelso, Nathaniel Vaughn. This polygon shapefile depicts 394 authorized Park Service units in the United States only that are over 100,000 acres. The data does not include a... North American Cartographic Information Society.

35. U.S. Parks and Protected Land Areas with Scale Ranking, 1:10 million (2012)

2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This polygon shapefile depicts 394 authorized Park Service units in the United States only with scale rankings that are over 100,000 acres. Scale r... North American Cartographic Information Society.

36. U.S. Parks and Protected Land Lines, 1:10 million (2012)

2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This polyline shapefile depicts 394 authorized Park Service units in the United States only that are over 100,000 acres. The data does not include ... North American Cartographic Information Society.

37. U.S. State Boundaries, 1:110 million (2012)

2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This polygon shapefile depicts all countries having 10m admin-1 with scale ranks 1 or less. States depicted include internal, first-order administr... North American Cartographic Information Society.

38. U.S. State Boundaries with Large Lakes, 1:110 million (2012)

2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This polygon shapefile depicts internal, first-order administrative boundaries and polygons with large lakes for all but a few tiny countries. All ... North American Cartographic Information Society.

39. U.S. State Boundary Lines, 1:110 million (2012)

2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This polyline shape file depicts internal, first-order administrative boundaries and polygons for states of the United States. All countries havin... North American Cartographic Information Society.

40. U.S. States with Scale Ranking, 1:110 million (2012)

2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This polygon shapefile depicts all countries having 10m admin-1 with scale ranks 1 or less with scale ranking. States depicted include internal, fi... North American Cartographic Information Society.

41. United States Hazardous Material Routes, 2013

2012. United States. Bureau of Transportation Statistics, United States. Federal Motor Carrier Safety Administration., and United States. Department of Transportation. Research and Innovative Technology Administration. The Federal Motor Carrier Safety Administration (FMCSA) Hazardous Material Routes were developed using the 2004 First Edition TIGER/Line files. The... Research and Innovative Technology Administration/Bureau of Transportation Statistics.

42. 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.

43. The United States of America, W. Barker sculp. Philadelphia (Raster Image)

1796. Stanford University. Center for Spatial and Textual Analysis and Carey, Mathew, 1760-1839. This layer is a georeferenced raster image of a map of the United States originally created by Matthew Carey and engraved by William Barker. The or... Stanford Digital Repository.

44. 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).

45. 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).

46. Connecticut: Danbury sheet [1908 reprint]

1892. United States. Geological Survey. This is a scanned historical map of the Danbury Quadrangle in Connecticut shown at a scale of 1:62,500. This map was created by the US Geological S... US Geological Survey.

47. Connecticut: Derby sheet [1898 reprint]

1893. United States. Geological Survey. This is a scanned historical map of the Derby Quadrangle in Connecticut shown at a scale of 1:62,500. This map was created by the US Geological Sur... US Geological Survey.

48. Connecticut: Derby sheet [1907 reprint]

1893. United States. Geological Survey. This is a scanned historical map of the Derby Quadrangle in Connecticut shown at a scale of 1:62,500. This map was created by the US Geological Sur... US Geological Survey.

49. Connecticut: Derby sheet [1942 reprint]

1893. United States. Geological Survey. This is a scanned historical map of the Derby Quadrangle in Connecticut shown at a scale of 1:62,500. This map was created by the US Geological Sur... US Geological Survey.

50. Connecticut: Gilead sheet [1892]

1892. United States. Geological Survey. This is a scanned historical map of the Gilead Quadrangle in Connecticut shown at a scale of 1:62,500. This map was created by the US Geological Su... US Geological Survey.