TY - RPRT TI - Chlorofluorocarbon and tritium age determination of ground-water recharge in the Ryan Flat subbasin, Trans-Pecos Texas AU - J. R. Bartolino PY - 1997 DO - 10.3133/wri964245 UR - https://pubs.usgs.gov/publication/wri964245 ID - wri964245 ER -