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.
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1995. National Geospatial-Intelligence Agency. This datalayer is a polygon coverage representing areas of land ice such as glaciers, snow and ice fields located throughout current VMap1 geograph...
1995. National Geospatial-Intelligence Agency. This datalayer is a polyline coverage representing landform features such as Crevices (Crevasses), faultlines and ice cliffs located throughout cur...