Copeia · 1961 · 26 citations · 0 references
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preparation of the manuscript. We are also indebted to Dr. W. Bockermann, Sao Paulo, Brasil, Mr. Eric-Phillips, Alto Paraguay, Dr. F. Salces of the Universidad de Cordoba, Argentina, and Dr. O. Lombardero of the Universidad del Nordestet, Corrientes, Argentina, for their assistance. This project was financially supported by the Consejo Nactional de Investigaciones Cientificas y Tecnicas, Argentina.