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Chest--Diseases.
Remove constraint All Subjects: Chest--Diseases.
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Coal miners--Diseases--Appalachian Region.
Remove constraint All Subjects: Coal miners--Diseases--Appalachian Region.
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Respiratory organs--Obstructions.
Remove constraint All Subjects: Respiratory organs--Obstructions.
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Chest--Diseases.
Remove constraint Subject Topical: Chest--Diseases.
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