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“The Need To Build Upon Farmer Practice And Knowledge: Reminders From Selected Upland Conservation Projects And Policies”. Agroforestry Systems 9 (2): 141-153. doi:10.1007/BF00168259. https://doi.org/10.1007/BF00168259.
. 1989. “A Diagnostic Survey Of Shifting Cultivation In Northern Laos: Targeting Research To Improve Sustainability And Productivity”. Agroforestry Systems 13 (2): 95-109. doi:10.1007/BF00140235. https://doi.org/10.1007/BF00140235.
. 1991.