http://pec.lib.wvu.edu/record/P165711972Changes in ventilatory function in coal miners after a work shift. Journal article reprint from: <em>Archives of Environmental Health</em>, v.24 (1972:Mar.). Lapp, N. LeRoy.Burgess, Dean B.Hankinson, John L.O'Brien, Richard J.Lungs--Dust diseases--Research.Coal miners--Diseases--Research.Respiratory organs--Research.Pneumoconiosis--Research.14256