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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.
2005, 2006, 2007, and 2008. United States. Department of Commerce, United States. National Oceanic and Atmospheric Administration, and United States. National Ocean Service. This polygon shapefile contains outer continental shelf (OCS) lease blocks in the northeast region. OCS blocks are used to define small geographic ... United States. National Ocean Service.