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