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McBride, W. Wayne.
Remove constraint All Creators: McBride, W. Wayne.
All Creators
Pendergrass, Eugene Percival, 1895-
Remove constraint All Creators: Pendergrass, Eugene Percival, 1895-
Subject Topical
Coal miners--Diseases--Pennsylvania.
Remove constraint Subject Topical: Coal miners--Diseases--Pennsylvania.
Subject Topical
Coal mines and mining--Pennsylvania.
Remove constraint Subject Topical: Coal mines and mining--Pennsylvania.
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