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