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1. 1:1,000,000-Scale State Boundaries of the United States, 2012

2012. National Atlas of the United States. This polygon shapefile portrays the state boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer was created by e... National Atlas of the United States.

2. United States National Atlas Water Feature Areas, 2012

2012. National Atlas of the United States and Environmental Systems Research Institute (Redlands, Calif.). This polygon shapefile represents the water feature areas (for example, glaciers, lakes, reservoirs, and swamps) of the United States at 1:1,000,00... Environmental Systems Research Institute (Redlands, Calif.).

3. U.S. National Atlas Water Feature Areas, 2012

2012. National Atlas of the United States and Esri. U.S. National Atlas Water Feature Areas represents the water feature areas (for example, glaciers, lakes, reservoirs, and swamps) of the United Sta... Esri.