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These references are in PubMed. This may not be the complete list of references from this article.
- Osborn H. F. Biological Inductions from the Evolution of the Proboscidea. Proc Natl Acad Sci U S A. 1933 Jan;19(1):159–163. doi: 10.1073/pnas.19.1.159. [DOI] [PMC free article] [PubMed] [Google Scholar]

