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Diffusion of innovations in Sierra Leone, West Africa : first report of the introduction and diffusion of a new rice farming method among Koranko farmers in Alikalia, Koinadugu District, December 1973 - February 1974 : a study on human communication / A.W. Haas.
Leiden : Leiden State university. Institute of cultural and social studies, 1974.
64 p. : ill., graf., tab. ; 30 cm.