1993. Smithsonian Institution, Global Volcanism Program, National Atlas of the United States, and the United States Geological Survey, Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). U.S. National Atlas Volcanoes represents volcanoes thought to be active in the last 10,000 years, in and near the United States. Environmental Systems Research Institute, Inc. (ESRI).
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1995. National Geospatial-Intelligence Agency. This datalayer is a point coverage representing cave features located throughout current Vmap geographic coverage areas. Objects in this layer have...
1995. National Geospatial-Intelligence Agency. This datalayer is a point coverage representing geothermal features such as hot springs and fumaroles located throughout current VMap1 geographic c...
1995. National Geospatial-Intelligence Agency. This datalayer is a polygon coverage representing ground surface characteristics located throughout current VMap1 geographic coverage areas. Featur...
1995. National Geospatial-Intelligence Agency. This datalayer is a polyline coverage representing features associated with the extraction industry (mining) including flumes, conveyors and geophy...
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...
1995. National Geospatial-Intelligence Agency. This datalayer is a point coverage representing rock formations located throughout current VMap1 geographic coverage areas. Features in this layer ...
1995. National Geospatial-Intelligence Agency. This datalayer is a polygon coverage representing landforms located throughout desertified or arid regions found in current VMap1 geographic covera...
1995. National Geospatial-Intelligence Agency. This datalayer is a point coverage representing mines and quarries located throughout current VMap1 geographic coverage areas. Features in this lay...
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