Deliberately divided : inside the controversial study of twins and triplets adopted apart /Author: Segal, Nancy L.,
Publisher: Lanham : Rowman & Littlefield,
Date: [2021] This title can be found in 3 Iowa libraries.
Personality differences and biological variations: a study of twins,Author: Claridge, Gordon S
Publisher: New York, New York, Pergamon Press
Date: [1973] This title can be found in 4 Iowa libraries.
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