Soil organic matter studies : proceedings of a symposium on soil organic matter studies jointly organized by the International Atomic Energy Agency and the Food and Agriculture Organization of the United Nations in co-operation with AGROCHIMICA and held in Braunschweig, 6-10 September 1976. (Proceedings series)
Soil organic matter studies : proceedings of a symposium on soil organic matter studies jointly organized by the International Atomic Energy Agency and the Food and Agriculture Organization of the United Nations in co-operation with AGROCHIMICA and held in Braunschweig, 6-10 September 1976.