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1by Le Duy Thuoc, FAO, Rome (Italy). Agriculture Dept. eng, National Workshop on Investigations of Lands with Declining and Stagnating Productivity eng 12-23 Oct 1985 Hanoi (Viet Nam), Ministry of Agriculture, Hanoi (Viet Nam). National Inst. for Agricultural Planning and Projection eng
Published 1986Texto bibliotecaFAO IT