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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.
. 1988. I
Improved Production Systems As An Alternative To Shifting Cultivation. Fao Soils Bulletin No. 53. Rome: Food and Agriculture Organization of the United Nations. http://www.worldcat.org/oclc/11418879.
. 1984. U
Useful Farming Practices: New Edition. Tokyo: Japan Association for International Cooperation of Agriculture & Forestry. http://www.worldcat.org/oclc/22662784.
. 1988.