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Has extension failed? : a case study of maize-growing practices in Iringa, Tanzania
Vries, J. de, (1976)
Ujamaa villages and problems of institutional change, with emphasis on agricultural extension and development
Vries, J. de, (1977)
Farmer "resistance" to extension advice : who is to blame? ; a case study of cotton production in Mara Region, Tanzania
Keregero, K. J. B., (1977)