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2Site preparation regeneration in the lowland humed tropics: plantation experience in northern Brazilby 130220 Wadsworth, F.H., 46169 Baraham, S., 130980 WELKER, J.C., 67562 Figueroa C, J.C., 11086 Institute of Tropical Forestry, Río Piedras (Puerto Rico), 20713 University of Puerto Rico, Río Piedras (Puerto Rico), 36223 Management of the Forest of Tropical America: Prospects and technologies, San Juan (Puerto Rico), 22-27 Set 1986bibliotecaIICA