TY - RPRT TI - Abstracts of the symposium of the Geology and mineral deposits of the Ajo and Lukeville 1 degree x 2 degrees Quadrangle, Arizona AU - Floyd Gray PY - 1988 DO - 10.3133/ofr88217 UR - https://pubs.usgs.gov/publication/ofr88217 ID - ofr88217 ER -