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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.

1977

Brush, Stephen B. 1977. Agricultural Technology And Labor. In Mountain, Field, And Family: The Economy And Human Ecology Of An Andean Valley, 91-103. Philadelphia: University of Pennsylvania Press.

1952

Nimuendajú, Curt. 1952. The Turkuna [Sic Tukuna]. University Of California Publications; American Archaeology And Ethnology 45. Berkeley, CA: University of California Press.