TY - RPRT TI - The isotopic composition of ore lead of the Creede mining district and vicinity, San Juan Mountains, Colorado: Text of a talk presented at the San Juan Mountains symposium to honor Thomas A. Steven; Rocky Mountain Section meeting of the Geological Society of America, May 2, 1987, Boulder, Colorado AU - N.K. Foley AU - P.B. Barton AU - P. M. Bethke AU - B. R. Doe PY - 1988 DO - 10.3133/ofr88510 UR - https://pubs.usgs.gov/publication/ofr88510 ID - ofr88510 ER -