A study of roof in Pennsylvania mines contiguous to Monongahela River

Author: Paul, J. W.
Additional Authors: Calverley, J. G.
Year: 1933
Document Type: USBM
Issuing Agency: U.S. Dept. of the Interior, Bureau of Mines,
SUDOC: C 22.5:550
Series: Technical paper / United States Department of the Interior, Bureau of Mines ;
Report Number: 550
Subject: Coal mines and mining--Pennsylvania--Pittsburgh
Link: https://hdl.handle.net/2027/mdp.39015077565607

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