Anthracite mechanical-mining investigations :use of yielding steel supports (props) in combination with backfilling for mining thick, flat beds

Author: Hartley, John C.
Additional Authors: Brennan, Robert J., Cooner, John D.
Year: 1956
Document Type: BMRA
Issuing Agency: U.S. Dept. of the Interior, Bureau of Mines,
SUDOC: I 28.23:5290
Series: Report of investigations / United States Department of the Interior, Bureau of Mines ;
Report Number: 5290
Subjects: Coal-mining machinery
Anthracite coal industry
Link: https://hdl.handle.net/2027/mdp.39015078469528

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