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2013. Geological Survey (U.S.). This raster layer is a georeferenced image containing a 100-meter resolution land and water mask of the conterminous United States, with separate v... National Atlas of the United States.
2014. National Atlas of the United States. This line shapefile includes Global Map data showing the coastline of the United States, Puerto Rico, and the U.S. Virgin Islands. The United State... National Atlas of the United States.