TY - BOOK ID - 139084207 TI - Geology and fluorspar deposits, Northgate district, Colorado AU - Steven, Thomas A. AU - Colorado Geological Survey AU - Colorado State Metal Mining Fund AU - Geological Survey (U.S.) PY - 1960 PB - Washington, D.C. : Washington, D.C. : United States Department of the Interior, Geological Survey, Government Printing Office. DB - UniCat KW - Fluorspar KW - Geology UR - https://www.unicat.be/uniCat?func=search&query=sysid:139084207 AB - ER -