“Bulimulus approximatus” by Heller is a public-domain (CC0) artwork, free to view, download and reuse for any purpose. It is catalogued from the open collection of Smithsonian Open Access.
Dall, W. H. 1900. Additions to the Insular Land-Shell Faunas of the Pacific Coast, Especially of the Galapagos and Cocos Islands. Proc. Acad. Nat. Sci. Phila. 52 : 88-106.
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