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 I. McDougle letter to A. Estabrook, about research on mixed race marriages for Mongrel Virginians (5/3/1924), multiple pages (#1289)
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 Mongrel Virginians: The Win Tribe, by A.H. Estabrook and I.E. McDougle, introduction of Estabrook's copy with added keys to pseudonyms, multiple pages (#1341)
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 Mongrel Virginians: The Win Tribe, by A.H. Estabrook and I.E. McDougle, typescript corresponding to pp16-19 of book, w/ hand-written pseudonyms, multiple pages (#1339)
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 Infant mortality rates in the US by nationality of mother (#552)
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 Interview on race mixing for Mongrel Virginians, by Ivan McDougle and Gwendolyn Watson (April 24, 1924), multiple pages (#1428)
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 "Inventiveness by racial stock in the United States" and "Race Descent of the Population of the United States," 3rd International Eugenics Conference (#1071)
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 Isaac Costa letter to Karl Pearson, about race mixing in Jamaica with reference to mulatto "just under your nose" (10/3/1908), multiple pages (#1948)
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 Issac Costa letter to Karl Pearson, with observations of race mixing in Jamaica provided his friend, "a relative of Florence Nightingale" (11/17/1908), multiple pages (#1955)
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 The Swedish Nation, "Folk and Race-Types" (Nordic, mixed-race, Finnish, Lapp, Lappic mixed-race, Walloon), multiple pages (#1634)
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 The Swedish Nation, "Racial Elements in Sweden" (Nordic, Finnish, Lapp, foreign), multiple pages (#1643)
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 Jamaica race mixing photo set provided by Isaac Costa, with Karl Pearson's handwritten instructions for publication in Biometrika (vol. 6:4), multiple pages (#1965)
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Race Mixing and Marriage Laws