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cultural ecology
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Behrens, Clifford A. (1986) 1986. “Relationships Between Shipibo and Western Soil Classification: Changes in Land Use Patterns With Cash Cropping”. In Paper Presented at 85th Annual Meeting of the American Anthropological Association, 5 December 1986, Philidelphia.
Behrens, Clifford A. (1989) 1989. “The Scientific Basis for Shipibo Soil Classification and Land Use: Changes in Soil-Plant Associations With Cash Cropping”. American Anthropologist 91 (1): 83-100. doi:10.1525/aa.1989.91.1.02a00050.