http://pec.lib.wvu.edu/record/P165681971Serum trypsin inhibitor concentrations in coal miners with respiratory symptoms. Journal article reprint from: <em>The Journal of the American Medical Association</em>, v.215 (1971:Feb.15). Lapp, N. LeRoy.Resnick, Harold.Morgan, William Keith C.Coal miners--Diseases.Pneumoconiosis.Lungs--Dust diseases.Respiratory organs--Obstructions.14256