“The South American Geologic Formations in the voyages of Charles Darwin and Alcide d’Orbigny Geologic maps, fossils and itinerarias”, Registros. Revista de Investigación Histórica, no. 5, pp. 136–160, Apr. 2008, Accessed: Aug. 24, 2026. Available: https://revistasfaud.mdp.edu.ar/registros/article/view/367