Humic substances in soil and crop sciences. Selected readings : Proceedings of a symposium cosponsored by the International Humic Substances Society. Humic substances in soil and crop sciences. Selected readings : Proceedings of a symposium cosponsored by the International Humic Substances Society.

by Symposium December 2 : Chicago, Illinois : 40883., Bloom, P.R. 40884., Clapp, C.E. 40885., MacCarthy, Patrick 40886., Malcom, R.L. 40887., International Humic Substances Society 40888.
Published 1990

Humic substances in soil and crop sciences. Selected readings : Proceedings of a symposium cosponsored by the International Humic Substances Society.

by Symposium December 2 : Chicago, Illinois : 40883., Bloom, P.R. 40884., Clapp, C.E. 40885., MacCarthy, Patrick 40886., Malcom, R.L. 40887., International Humic Substances Society 40888.