"Pneumoconiosis study of Pennsylvania anthracite miners. "; "Pendergrass, Eugene Percival, 1895-", "McBride, W. Wayne.", "Lieben, Jan."; "Pneumoconiosis--Diagnosis.", "Chest--Diseases--Research.", "Pneumoconiosis--Research.", "Lungs--Dust diseases--Diagnosis.", "Coal mines and mining--Pennsylvania.", "Coal miners--Diseases--Pennsylvania--Research."; "Pendergrass, Eugene Percival, 1895-", "Lieben, Jan.", "McBride, W. Wayne."; "1966"; "Journal article reprint from: Journal of Occupational Medicine, v.8:no.7 (1966:July). "; ""; "P16565"; "pec"; "Pneumoconiosis--Research.", "Pneumoconiosis--Diagnosis.", "Coal mines and mining--Pennsylvania.", "Lungs--Dust diseases--Diagnosis.", "Chest--Diseases--Research.", "Coal miners--Diseases--Pennsylvania--Research."; "14256"; .