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Subject Topical
Chest--Diseases.
Remove constraint Subject Topical: Chest--Diseases.
Subject Topical
Coal miners--Diseases.
Remove constraint Subject Topical: Coal miners--Diseases.
Subject Topical
Coal miners--Mortality.
Remove constraint Subject Topical: Coal miners--Mortality.
Subject Topical
Pneumoconiosis--Pathology.
Remove constraint Subject Topical: Pneumoconiosis--Pathology.
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