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Bristol, Leonard J.
Remove constraint All Creators: Bristol, Leonard J.
All Creators
Reger, Robert B.
Remove constraint All Creators: Reger, Robert B.
Subject Topical
Chest radiography.
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Coal miners--Diseases--Diagnosis.
Remove constraint Subject Topical: Coal miners--Diseases--Diagnosis.
Subject Topical
Pneumoconiosis.
Remove constraint Subject Topical: Pneumoconiosis.
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