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by Komisaruk, Barry R., Ph.D.; Flores, Carlos Beyer; Whipple, Beverly
by Snell, Bruno
by Descartes, Rene; Quintas, Guillermo
by Ardrey, Robert
by Barnett, S. A.
by Margulis, Lynn; Olendzenski, Lorraine
by Huizinga, Johan; De la Pena, Alejandro Rodriguez
by Vallejo, Jose Luis Castilla; Perdigon, Adrian Garcia; Gonzalez, Yurena Gonzalez
by Foladori, Guillermo
by De Oliva, Fernan Perez; Puga, Maria Luisa Cerron