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John W. Rowe, Egg Size and Shape Variation with̀in and among Nebraskan Painted Turtle (Chrysemys picta bellii) Populations: Relationships to Clutch and Maternal Body Size, Copeia, Vol. 1994, No. 4 (Dec. 19, 1994), pp. 1034-1040
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John W. Rowe (1994) studied this question.
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