A remarkable ground sloth Lull, Richard Swann, 1867-1957 creator text book New Haven Yale University Press 1929 1929
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ENG Published on the Othniel Charles Marsh Publication Fund. New Mexico Paleontology Sloths, Fossil QE882.E2 L8 569.31 Peabody Museum of Natural History, vol. 3, pt. 2 https://www.biodiversitylibrary.org/bibliography/5988 1153042 gs30000160 10.5962/bhl.title.5988