Salvage of coal from mine refuse in the Pittsburgh district

Author: Fraser, Thomas.
Additional Authors: Graham, H. G., Kelley, J. A.
Year: 1944
Document Type: BMRA
Issuing Agency: U.S. Dept. of the Interior, Bureau of Mines,
SUDOC: I 28.23:3768
Series: Report of investigations / United States Department of the Interior, Bureau of Mines ;
Report Number: 3768
Subject: Coal--Pennsylvania--Pittsburgh
Link: https://hdl.handle.net/2027/mdp.39015078497024

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