The structure of the Columella auris in the Pelycosauria / by E. D. Cope Cope, E. D. (Edward Drinker), 1840-1897 creator text multivolume monograph [Washington 1885] 1885
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ENG Columella auris Pelycosauria Reptiles, Fossil Mem. Nat. Acad. Sci, Washington. 1884 (1885). 3. No. 7 Museum of Comparative Zoology--Biodiversity Heritage Library digitization project https://www.biodiversitylibrary.org/bibliography/4045 81708734 10.5962/bhl.title.4045 HMZ