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Sex-differentiation in the viviparous teleost "Xiphophorus helleri" Heckel ...Essenberg, Jacob Martin, January 1900 (has links)
Thesis (Ph. D.)--University of Chicago, 1922. / "Private edition, distributed by the University of Chicago libraries, Chicago, Illinois." "Reprinted from Biological bulletin, vol. XLV, no. I, July, 1923." Bibliography: p. 75-77. Also available on the Internet.
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