Humic substances and chemical contaminants proceedings of a workshop and symposium cosponsored by the International Humic Substances Society, Divisions S-2, S-1, S-3, S-4, and S-11 of the Soil Science Society of America, and Division A-5 of the American Society of Agronomy, Anaheim, California, 26-27 October 1997 - Clapp, C.E; Hayesm M.H.B; Senesi, Nicola 1943- (Soil Science Society of America, Inc., 2015)