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Lieben, Jan.
Remove constraint All Creators: Lieben, Jan.
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Pendergrass, Eugene Percival, 1895-
Remove constraint All Creators: Pendergrass, Eugene Percival, 1895-
Subject Topical
Coal mines and mining--Pennsylvania.
Remove constraint Subject Topical: Coal mines and mining--Pennsylvania.
Subject Topical
Lungs--Dust diseases.
Remove constraint Subject Topical: Lungs--Dust diseases.
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