Twin Studies
10 objects illustrate this topic:

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12-year-old male twins undergoing anthropometric study by Otmar Freiherr von Verschuer, multiple pages (#2277)
16-year-old female twins undergoing anthropometric study by Otmar Freiherr von Verschuer, multiple pages (#2268)
40-year-old male twins undergoing anthropometric study by Otmar Freiherr von Verschuer, multiple pages (#2264)
"Are three human beings ever exactly alike?" (#472)
Male twins undergoing spirometry by Otmar Freiherr von Verschuer (#2267)
"Mental and Physical Traits of Identical Twins Reared Apart," by H.H. Newman, Journal of Heredity (vol. 25), multiple pages (#2302)
"Mental disorders in twins," 3rd International Eugenics Conference (#1088)
Profile of Mrs. Gilbert Grosvenor (daughter of Alexander Graham Bell), People (April 1931) (#1605)
Questions for a study of heredity in twins (#52)
"Schedule for the Study of Twins," Eugenics Record Office form, multiple pages (#1742)