Food and Agriculture Organization of the United Nations (FAO). Soil Resources, Management and Conservation Service. (1984) 1984. 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.
Food and Agriculture Organization of the United Nations (FAO). Soil Resources, Management and Conservation Service
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Food and Agriculture Organization of the United Nations (FAO). Soil Resources, Management and Conservation Service
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Food and Agriculture Organization of the United Nations (FAO). Soil Resources, Management and Conservation Service