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Lainhart, W. S. (William S.)
Remove constraint All Creators: Lainhart, W. S. (William S.)
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Coal mines and mining--Appalachian Region.
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Lungs--Dust diseases.
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Pneumoconiosis.
Remove constraint All Subjects: Pneumoconiosis.
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Chest--Diseases.
Remove constraint Subject Topical: Chest--Diseases.
Subject Topical
Pneumoconiosis.
Remove constraint Subject Topical: Pneumoconiosis.
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