TY - RPRT TI - Studies in the Providenclia area, Mexico, II, K-Ar and Rb-Sr ages of intrusive rocks and hydrothermal minerals AU - M. A. Lanphere PY - 1967 DO - 10.2113/gsecongeo.62.6.862 UR - https://pubs.usgs.gov/publication/70221303 ID - 70221303 ER -