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1988

McCracken, Jennifer A., and Jules N. Pretty. 1988. Glossary Of Selected Terms In Sustainable Agriculture. Gatekeeper Series No. Sa6. London; Washington, DC: International Institute for Environment and Development, Sustainable Agriculture Programme. http://www.worldcat.org/oclc/19531919.
McCall, Michael Keith. 1988. Indigenous Technical Knowledge In Farming Systems And Rural Technology: A Bibliography On Eastern Africa. Working Paper (Technische Hogeschool Twente. Vakgroep Ontwikkelingskunde) No. 38. [Enschede, Netherlands]: University of Twente, Technology and Development Group. http://www.worldcat.org/oclc/38348173.