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1by de Ridder, N. (ed.), International Livestock Centre for Africa, Addis Ababa (Ethiopia) eng 28071, van Keulen, H. (ed.), Seligman, N.G. (ed.), Neate, P.J.H. (ed.), Agricultural Research Organization, Bet Dagan (Israel) eng, Centrum voor Agrobiologisch Onderzoek, Wageningen (Netherlands) dut
Published 1986Texto bibliotecaFAO IT