gibbons, j. whitfield. 1990. chapter 14. sex ratios and
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Gibbons, J. Whitfield. 1990. Chapter 14. Sex Ratios and Their Significance among Turtle Populations. pp. 171-182. In Life History and Ecology of the Slider Turtle, J. Whitfield Gibbons (ed.). Smithsonian Institution Press. Washington, D.C.