Electrical symbols for mine maps

Author: Clark, H. H.
Year: 1912
Document Type: USBM
Issuing Agency: U.S. Dept. of the Interior, Bureau of Mines,
SUDOC: I 28.7:22
Series: Technical paper / United States Department of the Interior, Bureau of Mines ;
Report Number: 22
Subject: Electricity in mining--Notation
Link: https://hdl.handle.net/2027/mdp.39015077560491

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