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2. Worldwatch Paper;E. Eckholm,1979
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4. Perlin, J. 1991. A Forest Journey: The Role of Wood in the Development of Civilisation. Harvard University Press, Cambridge, MA, and London.
5. Perrow, M.R., and Davy, A.J. 2002. Handbook or Ecological Restoration, vol. 1 and 2. Cambridge University Press, Cambridge, UK.