01195cam a22002891 4500 gs 41000033 DLC 20260227111346.0 800820s1941 dcuabf b f001 0 eng gs 41000033 (OCoLC)6638781 DLC ICharE DLC n-us-co TN24.C6 S5 no. 911 Singewald, Quentin Dreyer, 1902- Ore deposits in the vicinity of the London fault of Colorado, by Quentin D. Singewald and B. S. Butler. Washington, U.S. Govt. Print. Off., 1941. vi, 74 p. incl. illus., tables, diagrs. 21 pl. (incl. fold. maps) 23 cm. U.S. Geological survey. Bulletin 911 At head of title: United States Dept. of the Interior, Harold L. Ickes, secretary. Geological survey, W. C. Mendenhall, director. Eight folded plates in pocket. Prepared in cooperation with the state of Colorado and the Colorado metal mining fund. Bibliographical footnotes. Ore deposits Colorado. Geology Colorado. Butler, B. S. (Bert Sylvenus), 1877-1960, joint author. 27697 27697