TY - RPRT TI - Geology and porphyry copper-type alteration-mineralization of igneous rocks at the Christmas Mine, Gila County, Arizona AU - Randolph A. Koski PY - 1979 DO - 10.3133/ofr79844 UR - https://pubs.usgs.gov/publication/ofr79844 ID - ofr79844 ER -