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Coal miners--Mortality.
Remove constraint All Subjects: Coal miners--Mortality.
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Lungs--Dust diseases.
Remove constraint All Subjects: Lungs--Dust diseases.
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Coal miners--Mortality.
Remove constraint Subject Topical: Coal miners--Mortality.
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Lungs--Dust diseases.
Remove constraint Subject Topical: Lungs--Dust diseases.
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Pneumoconiosis--Pathology.
Remove constraint Subject Topical: Pneumoconiosis--Pathology.
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