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D
Shifting Cultivation In Africa: The Zande System Of Agriculture. London, England: Routledge & Kegan Paul. https://ehrafworldcultures-beta.its.yale.edu/cultures/fo07/documents/060.
. 1956. B
“Building On Local Knowledge: The Challenge Of Agroforestry For Pastoral Areas”. Agroforestry Today (Kenya) 3 (4): 3-7.
. 1991. A
“Iita: Sustainable Systems”. African Farming: 50-51.
. 1987.