Progress report :experiments on strength of small pillars of coal in the Pittsburgh bed

Author: Greenwald, H. P.
Additional Authors: Howarth, H. C., Hartmann, Irving.
Year: 1941
Document Type: BMRA
Issuing Agency: U.S. Dept. of the Interior, Bureau of Mines,
SUDOC: I 28.23:3575
Series: Report of investigations / United States Department of the Interior, Bureau of Mines ;
Report Number: 3575
Subject: Coal mines and mining--Pennsylvania--Pittsburgh
Link: https://hdl.handle.net/2027/mdp.39015078495085

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