Experiments on strength of small pillars of coal in the Pittsburgh bed

Author: Greenwald, H. P.
Additional Authors: Hartmann, Irving., Howarth, H. C.
Year: 1939
Document Type: USBM
Issuing Agency: U.S. Dept. of the Interior, Bureau of Mines,
SUDOC: I 28.7:605
Series: Technical paper / United States Department of the Interior, Bureau of Mines ;
Report Number: 605
Subject: Coal mines and mining--Pennsylvania--Pittsburgh
Link: https://hdl.handle.net/2027/mdp.39015078485151

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