Anthracite mechanical-mining investigations:progress report 7: longhole retreat mining of a steeply pitching anthracite bed

Author: Allan, Andrew.
Additional Authors: Davis, Russell S.
Year: 1952
Document Type: BMRA
Issuing Agency: U.S. Dept. of the Interior, Bureau of Mines,
SUDOC: I 28.23:4925
Series: Report of investigations / United States Department of the Interior, Bureau of Mines ;
Report Number: 4925
Subject: Anthracite coal industry
Link: https://hdl.handle.net/2027/mdp.39015078469536

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