2006. National Atlas of the United States. This polygon shapefile contains federally owned or administered lands of the United States, Puerto Rico, and the U.S. Virgin Islands. Only areas of... National Atlas of the United States.
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2006. United States. Bureau of the Census, Environmental Systems Research Institute (Redlands, Calif.), and Harvard Geospatial Library. This polygon layer joins the ESRI World Census IPC Demographics attribute table to the ESRI Data & Maps 2008 : World Countries datalayer, to enable... ESRI.