TY - BOOK ID - 138348205 TI - Virgin Valley opal district, Humboldt County, Nevada AU - Staatz, Mortimer H. AU - Bauer, Herman L. AU - Geological Survey (U.S.) AU - U.S. Atomic Energy Commission PY - 1951 PB - Washington, D.C. : United States Department of the Interior, Geological Survey, DB - UniCat KW - Carnotite KW - Opals KW - Uranium KW - Nevada UR - https://www.unicat.be/uniCat?func=search&query=sysid:138348205 AB - ER -