http://pec.lib.wvu.edu/record/P177411933Soluble aluminum studies: III. The Relationship of nitrification and sulfur oxidation to the aluminum and hydrogen-ion concentrtration of some very acid soils.Journal article reprint from: <em>Soil Science</em>, v.36:no.1 (1933:July).Pohlman, G. G. (George Gordon), 1902-Soil acidity--Research.Aluminum.Nitrification.Hydrogen-ion concentration.Soil biochemistry--Analysis.14256