TY - BOOK ID - 137916074 TI - Economic geology of the Georgetown quadrangle (together with the Empire district) Colorado AU - Spurr, Josiah Edward AU - Garrey, G. H. AU - Ball, Sydney H. AU - Geological Survey (U.S.) PY - 1908 PB - Washington : Department of the Interior, United States Geological Survey, DB - UniCat KW - Mines and mineral resources KW - Geology, Economic KW - Colorado. UR - https://www.unicat.be/uniCat?func=search&query=sysid:137916074 AB - ER -