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