USGS Groundwater Information
ModelMuse: Graphical User Interface for MODFLOW-2005 and PHAST (TM 6-A29)
Groundwater: Ground water versus groundwater (OGW Technical Memo 2009.03)
Field Techniques for Estimating Water Fluxes Between Surface Water and Ground Water (TM 4–D2)
Ground-Water Availability in the United States (Circular 1323)
USGS maintains a network of active wells to provide basic statistics about groundwater levels.
USGS Water Science Centers are located in each state.
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