TY - RPRT TI - Preliminary geologic map of the Silverton 7.5-minute quadrangle, San Juan County, Colorado AU - R. G. Luedke AU - W. S. Burbank PY - 1996 DO - 10.3133/ofr96275 UR - https://pubs.usgs.gov/publication/ofr96275 ID - ofr96275 ER -