Sinking methods and costs for a small vertical shaft with steel supports : Keystone mine, Crested Butte, Colorado / by R.L. Bolmer.

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Main Author: Bolmer, R. L. (Robert L.)
Corporate Author: United States. Bureau of Mines
Format: Government Document Book
Language:English
Published: [Washington, D.C.] : U.S. Dept. of the Interior, Bureau of Mines, 1962.
Series:Information circular (United States. Bureau of Mines) ; 8086.
Subjects: