The design of small wooden head frames

Author: Staley, W. W.
Year: 1937
Document Type: USBI
Issuing Agency: U.S. Dept. of the Interior, Bureau of Mines,
SUDOC: I 28.27:6943
Series: Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number: 6943
Subjects: Mining engineering
Prospecting
Link: https://hdl.handle.net/2027/mdp.39015077569492

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