Ground Water. Nebraska Department of Natural Resources. The state agency website includes information not only on ground water statutes, use, contaminants, wells, and relationship to surface water, but also: water planning, dam safety, floodplain management and water administration. https://dnr.nebraska.gov/services
Groundwater Atlas of the United States: Kansas, Missouri and Nebraska Now available online, this classic title describes "the location, the extent, and the geologic and hydrologic characteristics of aquifers" in the region. https://pubs.usgs.gov/ha/ha730/ch_d/index.html