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Chest--Diseases.
Remove constraint All Subjects: Chest--Diseases.
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Lungs--Dust diseases--Prevention and control.
Remove constraint All Subjects: Lungs--Dust diseases--Prevention and control.
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Coal miners--Dust diseases--Prevention and control.
Remove constraint Subject Topical: Coal miners--Dust diseases--Prevention and control.
Subject Topical
Coal miners--Mortality.
Remove constraint Subject Topical: Coal miners--Mortality.
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