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1. Principal Aquifers of the 48 Conterminous United States [USGS_aquifers_us_Version 1.0]
This map layer contains the shallowest principal aquifers of the conterminous United States, Hawaii, Puerto Rico, and the U.S. Virgin Islands, portrayed as polygons. The map layer was developed ...


2. Principal Aquifers of the 48 Conterminous United States [USGS_aquifers_us]
These data are intended for use in publications, at a scale of 1:2,500,000 or smaller. Due to the small scale, the primary intended use is for regional and national data display and analysis, rather ...


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