Square-set system of mining

Author: Gardner, E. D.
Additional Authors: Vanderburg, William O.
Year: 1933
Document Type: USBI
Issuing Agency: U.S. Dept. of Commerce, Bureau of Mines,
SUDOC: C 22.11:6691
Series: Information circular / United States Department of Commerce, Bureau of Mines ;
Report Number: 6691
Subject: Mine timbering
Link: https://hdl.handle.net/2027/mdp.39015086485904

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