National Geologic Map Database
General Information
- Title: Estimates of tracer-based piston-flow ages of groundwater from selected sites: National Water-Quality Assessment Program, 1992-2005
- Author(s): Hinkle, S.R., Shapiro, S.D., Plummer, L.N., Busenberg, Eurybiades, Widman, P.K., Casile, G.C., and Wayland, J.E.
- Publishing Organization: U.S. Geological Survey
- Series and Number: Scientific Investigations Report SIR-2010-5229
- Publication Date: 2011
- Map Scale: 1:27,000,000
- Cross Section: None
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