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1. 100-Meter Resolution Impervious Surface of the Conterminous United States, 2001
2001. Geological Survey (U.S.). This raster layer is a georeferenced image containing impervious surface data for the conterminous United States. Data are in an Albers Equal-Area ... Geological Survey (U.S.).
2. 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.
3. 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.
4. 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.
5. Breeding Bird Survey Route Locations for Lower 48 States, 1966-1998
1966. Patuxent Wildlife Research Center. This line shapefile portrays the current routes used for conducting Breeding Bird Surveys in the lower 48 States. This layer is part of the 1997-20... National Atlas of the United States.
6. Causes of Forest Fragmentation in the United States (270 Meter Resolution), 1992
1992. Wade, Tim. This raster image is a 270-meter resolution grid map of the conterminous United States in GeoTIFF format, created from National Land Cover Data (NL... National Atlas of the United States.
7. Causes of Forest Fragmentation in the United States (540 Meter Resolution), 1992
1992. Wade, Tim. This raster layer is a 540 meter resolution grid map of the conterminous United States in GeoTIFF format, created from National Land Cover Data (NL... National Atlas of the United States.
8. Classification of Forest Fragmentation in North America, 1992
1992. Ritters, Kurt. This raster layer is a grid map of North America including the Caribbean and most of Mexico in GeoTIFF format. The map layer is an excerpt from a g... National Atlas of the United States.
9. 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.).
10. 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.
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