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USGS Water Resources: Principal Aquifers of the 48 Conterminous United States...
From the site: "This map layer contains the shallowest principal aquifers of the conterminous United States, Hawaii, Puerto Rico, and the U.S. Virgin Islands, portrayed as...-
Dataset Size: 0 bytes
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USGS Water Resources: National Stream Quality Accounting Network and National...
From the site: "This dataset and the accompanying Data Series report was created to assist in analysis and interpretation of water-quality data provided by the U.S. Geological...-
Dataset Size: 0 bytes
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