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Permissible explosives tested prior to January 1, 1911 and precautions to be taken in their use
Permissible explosives tested prior to January 1, 1912 and precautions to be taken in their use
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Published Year
1910-1919 (2)
Subject
Coal mines and mining--Explosives (2) *
Explosives (2)
Author
Hall, Clarence. (2) *
