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11. Principal Aquifers of the 48 Conterminous United States, Hawaii, Puerto Rico, and the U.S. Virgin Islands
2003. Geological Survey (U.S.). Water Resources Division. Wisconsin District. This polygon shapefile contains the shallowest principal aquifers of the conterminous United States, Hawaii, Puerto Rico, and the U.S. Virgin Islan... Geological Survey (U.S.).
12. Water-level surface in the Chicot equivalent aquifer system in southeastern Louisiana, 2009
Tomaszewski, Dan J. U.S. Geological Survey ;.