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Safety education in schools of mining districts
Some information on timbering bituminous-coal mines
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Published Year
1930-1939 (2)
Subject
Accidents--Prevention (1)
Mine timbering (1)
Author
Owings, C. W. (2) *
Crawford, Frank Stevens, (1)
Forbes, John J. V. (1)
Miller, Alexander Uriah, (1)
