TY  - RPRT
TI  - Estimates of tracer-based piston-flow ages of groundwater from selected sites: National Water-Quality Assessment Program, 1992–2005
AU  - Stephen R. Hinkle
AU  - Stephanie D. Shapiro
AU  - Niel Plummer
AU  - Eurybiades Busenberg
AU  - Peggy K. Widman
AU  - Gerolamo C. Casile
AU  - Julian E. Wayland
PY  - 2011
DO  - 10.3133/sir20105229
UR  - https://pubs.usgs.gov/publication/sir20105229
ID  - sir20105229
ER  -