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1by Hedlin, A.F., Forest Service, Washington, DC (USA) eng, Yates, H.O. III, Tovar, D.C., Ebel, B.H., Koerber, T.W., Secretaria de Agricultura y Recursos Hidraulicos, Mexico City (Mexico). Direccion General de Economia Agricola spa, Canadian Forestry Service, Ottawa, Ontario (Canada) eng
Published 1980Texto bibliotecaFAO IT