2003. USGS National Center for EROS. The North America Shaded Relief data were derived from the GTOPO30 elevation data. GTOPO30 is a global digital elevation model (DEM) with a horizon... National Atlas of the United States.
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1959. Geological Survey (U.S.), cartographer. Relief shown by contours and spot heights.; Shows portions of Harrison County, Indiana, and Meade County, Kentucky.; Compiled in 1956 from 1:25,000... United States, Department of the Interior, Geological Survey.
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.).
2005. 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.).
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.).
2002. 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.
1977. United States. Soil Conservation Service. Universal Transverse Mercator projection; 1927 North American datum.; May 1977.; Indexed. 92 x 66 centimeters 1:50,000. Dept. of Agriculture, Soil Conservation Service (Washington.).
2006. 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.
2002. United States. Forest Service and Geological Survey (U.S.). This raster layer portrays general forest cover types for the United States in GeoTIFF format. Data were derived from Advanced Very High Resolution... National Atlas of the United States.
1920. Jillson, Willard Rouse, 1890-1975. Base computed and drafted in 1917 by Lucien M. Sellier.; Includes index of productive oil and gas fields, statistics for oil and coal production, a... The Survey (Frankfort, Ky).