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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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