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Colorado
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Ores

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1.
A disseminated silver-lead-zinc sulfide occurrence at Hahns Peak, Routt County, Colorado
Author
Young, Edward J. (Edward Joseph), 1923-
Published
Washington : U.S. Govt. Print. Off., 1973.
Online
no.1367, no.1368 A-B, no.1369
Location
HathiTrust Digital Library >> Online Resource
Format
Books / Online
2.
Tests of low-grade and complex ores in Colorado
Author
Coghill, William Hawes, 1876-
Published
Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1923.
Online
Online book
Location
HathiTrust Digital Library >> Online Resource
Format
Books / Online
3.
Investigation of low-grade and complex ores in Colorado
Author
Hornor, R. R. (Roy R.)
Published
[Washington, D.C.] : U.S. Dept. of the Interior, Bureau of Mines, 1921.
Online
Online book
Location
HathiTrust Digital Library >> Online Resource
Format
Books / Online
4.
Some recent developments at Leadville : a Leadville fissure vein
Author
Butler, G. Montague (Gurdon Montague), 1881-1961
Published
Golden, Colo. : Colorado School of Mines, 1913.
Online
Online book
Location
HathiTrust Digital Library >> Online Resource
Format
Books / Online
5.
Laboratory investigation of Schwartzwalder Ralston Creek ore : topical report WIN-71
Author
Porter, E. S.
Online
Online book
Location
HathiTrust Digital Library >> Online Resource
Format
Books / Online