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1.
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Charles Darwin. 1952. "Journal of researches into the geology and natural history of the various contries visited by H. M. S. Beagle", XIX-624 páginas, ilustrado. Halfner Publishing Co., New York, N. Y. 7.50 Dlls.
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2.
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Bibliometry of biological systematics in Latin America during the twentieth century in three global databases Llorente Bousquets, Jorge Enrique - Michán Aguirre, Layla
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