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By: Astor, Yrene M. - Scranton, Mary I - Guzmán, Laurencia - Thunell, Robert - Muller-Karger, Frank - Taylor, Gordon T. - Fanning, Kent - Varela, RamónType: ArticleIn: Gayana (Concepción)Volume:Series:Issue:Date: 2006-10-01Page Range:Publication Info:Subjects: