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2003. United States. Environmental Protection Agency. This polygon shapefile shows Omernik's Level III ecoregions, derived from a 1:7,500,000 map created by J.M. Omernik in 1987 and from refinements of... National Atlas of the United States.
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. A caldera is a large, generally circular depre... Geological Survey (U.S.) and National Atlas of the United States.
2014. United States. Bureau of Transportation Statistics and Hunt, Raquel. The Rail Network is a comprehensive database of United States railway system at 1:24,000 to 1:100,000 scale. This polyline shapefile depicts Amtrak... United States. Bureau of Transportation Statistics.
2013. Firestine, Theresa. Over 55 percent of the approximately 7,100 passenger transportation terminals in the United States offer travelers the ability to connect among the... United States. Bureau of Transportation Statistics.
2014. National Energy Information Center (U.S.). This polygon shapefile contains petroleum administration areas for defense districts (PADDs) within the United States as of 2014. PADDs are geograp... National Energy Information Center (U.S.).
2014. National Energy Information Center (U.S.). This line shapefile represents major petroleum product pipelines in the United States as of November 2014. This layer includes interstate trunk lin... National Energy Information Center (U.S.).
2014. National Energy Information Center (U.S.). This point shapefile represents all operable bulk petroleum product terminals located in the 50 States and the District of Columbia with a total bu... National Energy Information Center (U.S.).
2014. National Energy Information Center (U.S.). This point shapefile represents all operating petroleum refineries located in the United States, Puerto Rico, Guam, the U.S. Virgin Islands, and ot... National Energy Information Center (U.S.).
2004. Instituto Nacional de Estadística, Geografía e Informática (Mexico), Geological Survey (U.S.), and Canada Centre for Remote Sensing. This polygon shapefile depicts the political boundaries of North America, including: international boundaries, provincial boundaries, state or terr... Geological Survey (U.S.).
2004. Instituto Nacional de Estadística, Geografía e Informática (Mexico), Geological Survey (U.S.), and Canada Centre for Remote Sensing. This line shapefile depicts the political boundaries of North America, including: international boundaries, provincial boundaries, state or territo... Geological Survey (U.S.).