http://pec.lib.wvu.edu/record/P165521973The Prevalence of coal workers' pneumoconiosis in US coal miners.Journal article reprint from: <em>Archives of Environmental Health</em>, v.27 (1973:Oct.). Jacobson, George. Shoub, Earle P.Reger, Robert B.Morgan, William Keith C.Burgess, Dean B.Pendergrass, Eugene Percival, 1895-O'Brien, Richard J.Coal miners--Diseases--United States.Pneumoconiosis.Lungs--Dust diseases.14256