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1by Harmsen, R., International Poplar Commission eng 1 Oct 1984 Sess. 17 Ottawa, Ontario (Canada)
Published 1984Texto bibliotecaFAO IT -
2by Harmsen, R., Bliss, Fredrick A., Cardona, C., Posso G, Carmen Elisa, Osborn, Thomas C.
Published 1987Journal Article bibliotecaCGIAR