2003. Geological Survey (U.S.). This point shapefile represents locations of agricultural minerals operations in the United States. The data represent commodities covered by the M... National Atlas of the United States.
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2002. National Atlas of the United States. This polygon shapefile portrays a selected set of information that was collected for the 2002 Census of Agriculture by the National Agricultural St... National Atlas of the United States.
2007. National Atlas of the United States. This polygon shapefile portrays a selected set of information that was collected for the 2007 Census of Agriculture by the National Agricultural St... National Atlas of the United States.
2012. Geological Survey (U.S.). This point shapefile includes airports in the United States, Puerto Rico and the U.S. Virgin Islands. The data were derived from an extract of the ... Geological Survey (U.S.).
1866. American Central Railway Company. Relief shown using hachures.;1 map, colored;40 x 115 cm.;ca. 1:1,200,000. J. Bien (New York).
2005. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This line shapefile shows the outlines of major calderas and impact structures in the United States. This layer is part of the Geologic Map of the ... Geological Survey (U.S.).
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.
2001. National Atlas of the United States. The Bathymetric Shaded Relief of North America map layer shows depth ranges using colors, with relief enhanced by shading. The image was derived fr... National Atlas of the United States.
2001. National Atlas of the United States. The Bathymetry of North America map layer shows depth ranges using colors. The image was derived from the National Geophysical Data Center's ETOPO2... National Atlas of the United States.
1999. 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.