Placer Operations of Humphreys Gold Corporation, Clear Creek, Colo.
Gardner, E.D., and Jos. R. Guiteras
Placer Operations of Humphreys Gold Corporation, Clear Creek, Colo. Image Cover
Publisher:US Bureau of Mines
Place Published:Washington, DC
Genre:Mining
Series:Information Circular 6961
Pages:16
Format:Hardcover
Release:1937
Summary: