00919cam a22002651 4500 gs 52000268 DLC 20260227111359.0 821007s1952 dcuab b f000 0 eng c gs 52000268 (OCoLC)8840896 U.S. Geol. Survey. Libr. MsSM MsSM DLC premarc QE75 .C5 no. 186 553.49 Moore, Frank B. (Frank Baker), 1912- Pitchblende deposits at the Wood and Calhoun mines, Central City mining district, Gilpin County, Colo., by F.B. Moore and C.R. Bulter. Washington, 1952. 8 p. maps (1 fold. in pocket) diagrs. (2 in pocket) 27cm. Geological survey circular 186 "References cited": p. 8. Pitchblende. Butler, C.R., joint author. Geological Survey (U.S.). Circular ; 186. 28683 28683