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Coal-mine fatalities in the United States, 1920 :and coal-mine statistics supplementing those published in Bulletin 115, and a list of permissible explosives, lamps, and motors tested prior to January 31, 1921

Coal-mine fatalities in the United States, 1921

Published Year

• 1920-1929 (2)

Subject

• Coal mine accidents--United States (2) *
• Electric lamps (1)
• Electric motors--Testing (1)
• Explosives--Testing (1)

Author

• Adams, W. W. (2) *

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