Chlorofluorocarbons (CCl<sub>3</sub>F and CCl<sub>2</sub>F<sub>2</sub>) as dating tools and hydrologic tracers in shallow groundwater of the Delmarva Peninsula, Atlantic Coastal Plain, United StatesStacie Dunkle, Tyler B. Coplen, Pixie A. Hamilton et al.|Water Resources Research|1993Cited by 176