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By: Nichols, John T. (John Treadwell), - Boyle, Howarth S - Chapman South American ExpeditionEdition:Publication info: New York, N.Y, American Museum of Natural History, [1956]Volume: no. 1760Series:Holding Institution: American Museum of Natural History LibrarySubjects: 59.7,55S(82) Argentina Catfishes Classification Fishes Pygidium boylei Tilcara Region TrichomycteridaeBHL Collections: