1992. National Imagery and Mapping Agency (now National Geospatial-Intelligence Agency). This datalayer is a polygon coverage representing landcover features located throughout DCW (Digital Chart of the World) geographic coverage as of ... National Imagery and Mapping Agency.
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Geological Survey (U.S.) and Environmental Systems Research Institute (Redlands, Calif.). U.S. National Atlas Water Feature Areas represents the water feature areas (for example, bays, glaciers, lakes, and swamps) of the United States. ESRI.
1995. Geological Survey (U.S.) and Environmental Systems Research Institute (Redlands, Calif.). U.S. National Atlas Water Feature Areas represents the water feature areas (for example, bays, glaciers, lakes, and swamps) of the United States. ESRI.