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2002. National Atlas of the United States. This line shapefile represents the Continental Divide of the United States. The map layer was created by extracting Hydrologic Unit Boundary line f... National Atlas of the United States.
2010, 2011, and 2012. National Atlas of the United States, Environmental Systems Research Institute (Redlands, Calif.), and Geological Survey (U.S.). This point shapefile represents airports in the United States, Puerto Rico, and U.S. Virgin Islands with airport passenger enplanements of 25 passe... Environmental Systems Research Institute (Redlands, Calif.).