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Melones y cebollas en sus variedades from "El cultivo de legumbres en Puerto Rico."
Abyssinian wolf (Canis simensis) painted by Louis Agassiz Fuertes, Album of Abyssinian birds and mammals. Biodiversity Heritage Library.
Ruddy ducks (Erismatura rubida) in water painted by Louis Agassiz Fuertes, Birds of the Rockies. Biodiversity Heritage Library.
Bateleur eagles (Helotarsus ecaudatus) painted by Louis A. Fuertes, Album of Abyssinian birds and mammals. Biodiversity Heritage Library.
Louis Agassiz Fuertes, The Osprey, v.1. Biodiversity Heritage Library.
Cleofe Calderon and an unidentified colleague, National Museum of Natural History | Smithsonian Institution Archives, Cleofe Calderon, Accession 85-167, Soderstrom, Thomas R, Thomas R. Soderstrom Correspondence, Box 1
Cleofe Calderon examining a specimen at the National Museum of Natural History | Smithsonian Institution Archives, Cleofe Calderon, Accession 85-167, Soderstrom, Thomas R, Thomas R. Soderstrom Correspondence, Box 1
New Cuban Urocoptidae I from "The Nautilus, v.25"
Catalogue of the birds of Costa Rica, indicating those species of which the United States National Museum possesses specimens from that country from "Proceedings of the United States National Museum, v.8"
Felipe Poey. From The Popular Science Monthly, v. 25
Title page from "The Journal of Parasitology, v. 1"
Title page, Proceedings of the Washington Academy of Sciences, v.1