Shaft- and slope-bottom lay-outs at coal mines

Author: Anderson, Robert L.
Year: 1937
Document Type: USBI
Issuing Agency: U.S. Dept. of the Interior, Bureau of Mines,
SUDOC: I 28.27:6949
Series: Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number: 6949
Subject: Coal mines and mining
Link: https://hdl.handle.net/2027/mdp.39015077569542

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