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Estimates of tracer-based piston-flow ages of groundwater from selected sites: National Water-Quality Assessment Program, 2006-2010 [研究报告]
U.S. Geological Survey. 2012-01-01
Shapiro, Stephanie D.;  Plummer, L. Niel;  Busenberg, Eurybiades ebusenbe@usgs.gov;  Widman, Peggy K. pkwidman@usgs.gov;  Casile, Gerolamo C. jcasile@usgs.gov;  Wayland, Julian E. jwayland@usgs.gov;  Runkle, Donna L. dlrunkle@usgs.gov
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