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2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, and 2016. Gap Analysis Program (U.S.). This polygon shapefile contains combined PAD-US Fee and Easements features for the northwestern United States. The USGS Protected Areas Database of... Gap Analysis Program (U.S.).
2006. Rawson, Peg. This point shapefile depicts major dams in the United States, including Puerto Rico and the U.S. Virgin Islands. The map layer was created by extra... United States. Bureau of Transportation Statistics.