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Creator Personal Names
Owings, C. W. (Clarence Watson), 1894-
Remove constraint Creator Personal Names: Owings, C. W. (Clarence Watson), 1894-
Subject Topical
Coal mines and mining--Safety measures.
Remove constraint Subject Topical: Coal mines and mining--Safety measures.
Subject Topical
Mine explosions.
Remove constraint Subject Topical: Mine explosions.
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