Van Tuyl, Francis Maurice, 1887-1975Brewer, Quenton L.Boyd, James, 1904-19872022-05-102022-05-101932https://hdl.handle.net/11124/13028Includes bibliographical references.masters thesesengCopyright of the original work is retained by the author.Geology, Structural -- ColoradoGeology, Stratigraphic -- PrecambrianOre deposits -- ColoradoPreliminary study of the pre-Cambrian ore deposits of Colorado, AText