The nasal organ in Amphibia Higgins, George Marsh, 1890- creator text book Urbana, Ill University of Illinois c1921 1921
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ENG Thesis note on verso of t.-p. "Contributions from the Zoological laboratory of the University of Illinois under the direction of Henry B. Ward, no. 171." Thesis (PH.D.)--University of Illinois, 1919. Amphibians Anatomy Batrachia Sense-organs QL669 .H5 Illinois biological monographs, v. 6, no. 1 https://www.biodiversitylibrary.org/bibliography/16786 759206 10.5962/bhl.title.16786