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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.
2010. United States. National Oceanic and Atmospheric Administration, United States. National Ocean Service, and United States. Department of Commerce. This point shapefile contains the locations of the National Water Information System (NWIS) stations in the Northeastern United States. As part of ... United States. National Ocean Service.