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1by Peterson, R.M., North American Forestry Commission eng 21 Feb 1984 Sess. 12 El Paso, TX (USA)
Published 1984Texto bibliotecaFAO IT -
2by Peterson, R.M., Forest Service, Washington, DC (USA) eng, North American Forestry Commission eng 3 Feb 1986 Sess. 13 Chetumal (Mexico)
Published 1986Texto bibliotecaFAO IT