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The National safety competition of 1960

The National Safety Competition of 1961

The National Safety Competition of 1962

Published Year

• 1960-1969 (3)

Subject

• Mine accidents--United States--Statistics (3) *
• Mine safety (3) *

Author

• Elsner, Elizabeth K. (3)
• Wrenn, Virginia E. (3) *
• Machisak, John C. (2)
• Moyer, Forrest Theodore, (1)

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