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The National safety competition of 1959
The National safety competition of 1960
The National Safety Competition of 1961
The National Safety Competition of 1962
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Published Year
1960-1969 (4)
Subject
Mine safety (4) *
Mine accidents--United States--Statistics (3)
Author
Elsner, Elizabeth K. (4)
Wrenn, Virginia E. (4) *
Machisak, John C. (3)
Moyer, Forrest Theodore, (1)
