TY - BOOK AU - Schonherr,Siegfried TI - New extension methods to speed up diffusion of agricultural innovations T2 - Discussion paper; No.196 - 230 all bound in one book AV - EAF QTO H31.N28 No.200 PY - 1974/// CY - Nairobi PB - : University of Nairobi KW - Agricultural innovations ER -