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81. 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.

82. 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.

83. Annual Particulate Matter (Annual PM-2.5) Non-Attainment Designations in Region 9, 2011

2011. United States. Environmental Protection Agency, Region IX. This polygon shapefile contains designated areas for particulate matter < 2.5 microns, according to the annual National Ambient Air Quality Stan... United States. Environmental Protection Agency, Region IX.

84. Carbon Monoxide (CO): Federal Non-Attainment Area Designations: U.S. Region 9, 2011

2011. United States. Environmental Protection Agency. Region IX. This polygon shapefile represents nonattainment areas for carbon monoxide (CO) in EPA Region 9, including California, Nevada and Arizona, for 2011.... United States. Environmental Protection Agency. Region IX.

85. Lead (Pb): Federal Area Designations: California, 2011

2011. United States. Environmental Protection Agency. This polygon shapefile contains area designations of lead attainment (Pb) in California (Region 9). There are three categories of designations: : n... United States. Environmental Protection Agency. Region IX.

86. Late Wisconsin Glaciers, Alaska Palaeo-Glacier Atlas

2011. World Data Center for Paleoclimatology and NOAA Paleoclimatology Program (U.S.). This line shapefile represents the extent of glaciers during the late Wisconsin glaciation (also known as the Last Glacial Maximum, about 20,000 ye... World Data Center for Paleoclimatology.