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.
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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.
2006. 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.
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.).
1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, and 2006. Nature Conservancy (U.S.). This data product was created as part of the Northwest Atlantic Marine Ecoregional Assessment. The Nature Conservancy developed this science-based ... Northeast Ocean Data.
1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, and 2006. Nature Conservancy (U.S.). This data product was created as part of the Northwest Atlantic Marine Ecoregional Assessment. The Nature Conservancy developed this science-based ... Northeast Ocean Data.
1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, and 2006. Nature Conservancy (U.S.). This data product was created as part of the Northwest Atlantic Marine Ecoregional Assessment. The Nature Conservancy developed this science-based ... Northeast Ocean Data.
1966, 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, and 1998. 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.
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.
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.