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You searched for: All Creators Crawford, George M. Remove constraint All Creators: Crawford, George M. All Subjects Chest radiography. Remove constraint All Subjects: Chest radiography. All Subjects Coal miners--Diseases--Pennsylvania. Remove constraint All Subjects: Coal miners--Diseases--Pennsylvania. All Subjects Lungs--Dust diseases. Remove constraint All Subjects: Lungs--Dust diseases. All Subjects Respiratory organs--Obstructions. Remove constraint All Subjects: Respiratory organs--Obstructions. Subject Topical Chest radiography. Remove constraint Subject Topical: Chest radiography. Subject Topical Coal mines and mining--Pennsylvania. Remove constraint Subject Topical: Coal mines and mining--Pennsylvania.

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