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Coal mines and mining--Appalachian Region.
Remove constraint All Subjects: Coal mines and mining--Appalachian Region.
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Lungs--Dust diseases.
Remove constraint All Subjects: Lungs--Dust diseases.
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Chest radiography.
Remove constraint Subject Topical: Chest radiography.
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Chest--Diseases.
Remove constraint Subject Topical: Chest--Diseases.
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