Electrical and mechanical hazards and falls of persons at metal and nonmetallic mines :metal- and nonmetallic-mine accident-prevention course.

Year: 1957
Document Type: MAIN
Issuing Agency: U.S. G.P.O.,
SUDOC: I 28.6:56/957
Series: Miners' circular ;
Report Number: 56
Subject: Mine safety--United States
Link: https://hdl.handle.net/2027/mdp.39015077562588

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