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2011. United States. Federal Highway Administration. Office of Highway Policy Information and United States. Bureau of Transportation Statistics. The Federal Highway Administration (FHWA) has the responsibility to assure that adequate highway transportation information is available to support... United States. Bureau of Transportation Statistics.
2011. United States. Bureau of Transportation Statistics and United States. Federal Highway Administration. This polyline shapefile depicts the National Highway Planning Network, a comprehensive network database of the United States' major highway system.... United States. Bureau of Transportation Statistics.
2011. United States. Bureau of the Census. Geography Division and United States. Bureau of Transportation Statistics. This polyline shapefile depicts hydro coverages that were created using TIGER/Line 2000 shapefile data gathered from ESRI's Geography Network. The ... United States. Bureau of Transportation Statistics.
2011. United States. Bureau of the Census. Geography Division and United States. Bureau of Transportation Statistics. This polygon shapefile depicts hydrography coverages that were created using TIGER/Line 2000 shapefile data gathered from ESRI's Geography Network.... United States. Bureau of Transportation Statistics.
2005. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This point shapefile shows the locations of impact structures in the United States. An impact structure is a crater formed by the impact of a meteo... Geological Survey (U.S.) and National Atlas of the United States.
2006. National Atlas of the United States. This polygon shapefile shows Indian lands of the United States. Only areas of 640 acres or more are included. Federally-administered lands within a... National Atlas of the United States.
2001. Geological Survey (U.S.) and Godt, Jonathan W. These polygon shapefile is a digital version of U.S. Geological Survey Professional Paper 1183, Landslide Overview Map of the Conterminous United S... National Atlas of the United States.
2010. National Geophysical Data Center. This map layer shows isogonic lines (lines of constant declination of the Earth's magnetic field), derived from the International Geomagnetic Refer... National Atlas of the United States.
2010. National Geophysical Data Center. This line shapefile shows lines of equal horizontal intensity of the Earth's magnetic field, derived from the International Geomagnetic Reference F... National Atlas of the United States.
2010. National Geophysical Data Center. This shapefile shows isoclinic lines (lines of constant inclination of the Earth's magnetic field), derived from the International Geomagnetic Refe... National Atlas of the United States.