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Permissible explosives, mining equipment and apparatus approved prior to January 1, 1923
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Published Year
1920-1929 (1)
Subject
Coal mines and mining--Safety measures (1) *
Explosives (1)
Author
Fieldner, Arno Carl, (1)
Howell, Spencer P. (1) *
Ilsley, Lee C. (1)
Parker, Dorsey J. (1)
