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2. Use of Plant Resources by the Chacobo;Bloom,1989
3. Can the Growing Human Population Feed Itself?;Bongaarts;Sci. American,1994
4. The History of the Human Population;Coale,1974
5. Energy Situation in Thailand, ASEAN-EC Seminar on Energy from Biomass, 1993;Coovattanachai;FAO/RAPA Bulletin,1993