"Impairment of oxygen transfer in dyspneic, nonsmoking soft coal miners. "; "Rasmussen, Donald L."; "Coal miners--Diseases--Research.", "Lungs--Dust diseases--Research.", "Pneumoconiosis--Research.", "Respiratory organs--Research."; "Rasmussen, Donald L."; "1971"; "Journal article reprint from: The Journal of Occupational Medicine, v.13:no.6 (1971:June). "; ""; "P16579"; "pec"; "Coal miners--Diseases--Research.", "Pneumoconiosis--Research.", "Respiratory organs--Research.", "Lungs--Dust diseases--Research."; "14256"; .