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 .
- Geological Survey (U.S.). Circular ; 186. .