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Ulluwishewa, Rohana. 1993. Indigenous Practices Of Aquatic Resource Management In The Dry Zone Of Sri Lanka. In Human Evolution In Its Ecological Context: Proceedings Of The Pithecanthropus Centennial 1893-1993 Congress, Under The Auspices Of The Royal Netherlands Academy Of Arts And Sciences. Leiden, The Netherlands: Pithecanthropus Centennial Foundation, Leiden University. http://www.worldcat.org/oclc/36381768.
U.S. National Research Council, Committee on Selected Biological Problems in the Humid Tropics. 1982. Agriculture In The Humid Tropics. In Ecological Aspects Of Development In The Humid Tropics, 93-156. Washington, DC: National Academy Press. https://doi.org/10.17226/19533.