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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. G
“The Lari Soils Project In Peru - A Methodology For Combining Cognitive And Behavioral Research”. In The Cultural Dimension Of Development: Indigenous Knowledge Systems, 71-81. London: Intermediate Technology Publications Ltd [Practical Action Publishing]. https://www.worldcat.org/title/257046951.
. 1995. P
Land And Water Strategy, The Process Begins: Workbook On Soil. [Winnipeg, MB]: Province of Manitoba [Natural Resources, Water Resources Branch]. http://www.worldcat.org/oclc/184878384.
. 1990.