Chemistry in the soil environment : proceedings of a symposium sponsored by Division S-2 of the American Society of Agronomy and the Soil Science Society of America : the papers were presented during the annual meetings in Fort Collins, Colorado, August 5-10, 1979 / organizing committee, D.E. Baker ; editorial committee, R.H. Dowdy, J.A. Ryan, V.V. Volk, D.E. Baker ; editor-in-chief, Matthias Stelly ; managing editor, David M. Kral ; assistant editor, Mary Kay Cousin.