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Humus Acids of Soils by Orlov, D. S., Kothekar, V. S. ISBN: 9789061914532

Humic Substances of Soils and General Theory of Humification by Orlov, D. S., Kothekar, V. S. ISBN: 9789061919551 List Price: $157.00

Soil Chemistry by Orlov, D. S., Kothekar, V. S. ISBN: 9789061919155 List Price: $140.00