"Environmental dust study of anthracite coal mines of Eastern Pennsylvania. "; "Diakun, R.", "Baier, Edward J."; "Coal dust--Measurement--Pennsylvania.", "Pneumoconiosis.", "Coal miners--Diseases--Pennsylvania.", "Coal mines and mining--Pennsylvania."; "Diakun, R.", "Baier, Edward J."; "1963"; "Journal article reprint from: Journal of Occupational Medicine, v.5:no.8 (1963:Aug.). "; ""; "P16564"; "pec"; "Coal dust--Measurement--Pennsylvania.", "Pneumoconiosis.", "Coal mines and mining--Pennsylvania.", "Coal miners--Diseases--Pennsylvania."; "14256"; .