Underground transportation in the Ruhr coal-mining district of Germany

Author: Stahl, R. W.
Additional Authors: Benson, J.B., Sanford, H.E.
Year: 1950
Document Type: USBI
Issuing Agency: U.S. Dept. of the Interior, Bureau of Mines,
SUDOC: I 28.27:7547
Series: Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number: 7547
Subject: Coal mines and mining--Germany--History--1950
Link: https://hdl.handle.net/2027/mdp.39015078464032

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