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2013. Geological Survey (U.S.). This raster layer is a100-meter resolution land and water mask in (GeoTIFF format) of the conterminous Alaska, with separate values for oceans and ... 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.