These publications are related to water, water resources, and hydrogeology. The Groundwater Reports series was discontinued and was superseded by the Hydrologic Reports series. Hydrogeologic Sheets are essentially geologic maps of relatively small areas with a hydrogeologic focus and include data on groundwater elevation and chemistry. Of course, a large number of our publications not listed here — like geologic maps, open-file reports, and several of our technical monographs — relate directly or indirectly to water resources as well. We also have two Decision Makers Field Guides that focused on water resource issues that are written for a non-technical audience. See our Aquifer Mapping Program page for the results of more current water-related work.