TY - RPRT TI - Preliminary study of certain cation-exchange properties of clinoptilolite-bearing Rockyford Ash Member of the Miocene Sharps Formation at Craven Creek near Wanblee, South Dakota AU - George A. Desborough PY - 1989 DO - 10.3133/ofr89289 UR - https://pubs.usgs.gov/publication/ofr89289 ID - ofr89289 ER -