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William E. Cooper, Jr., Caroline S. Adams, James L. Dobie, Female Color Change in the Keeled Earless Lizard, Holbrookia propinqua: Relationship to the Reproductive Cycle, The Southwestern Naturalist, Vol. 28, No. 3 (Aug. 19, 1983), pp. 275-280
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Cooper et al. (1983) studied this question.
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