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“Elements Of Success: Sustainable Development In Sub-Saharan Africa”. In World Resources 1987: An Assessment Of The Resource Base That Supports The Global Economy, 221-238. Washington, DC: Basic Books. https://www.wri.org/publication/world-resources-1987.
. 1987. A
“Iita: Sustainable Systems”. African Farming: 50-51.
. 1987.