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        Lionel Penrose letter to Lancelot Hogben about early results from his Colchester survey suggesting non-hereditary factors in mental illness (7/19/32) (#2227)
       
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        "Mania depressus," flash card on genetic defects (#746)
       
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        Mary Dendy letter to Karl Pearson, about case of "Alfred D. aged 18 Feeble-minded" whose only work is "holding pigs whilst they are slaughtered", multiple pages (#1939)
       
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        Mary Dendy letter to Karl Pearson, about definitions and confusing terms used to grade feeble-mindedness (12/5/1912), multiple pages (#1942)
       
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        Mary Dendy letter to Karl Pearson, about difficulties in collecting pedigree data and interpreting disease traits in "defective children" (12/9/1906), multiple pages (#1931)
       
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        Mary Dendy letter to Karl Pearson, follow-up on definition of feeble-mindedness with reference to British eugenic legislation (12/5/1912) (#1941)
       
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        Mendel's Law Poem, by Joseph DeJarnette, MD, witness in Buck vs. Bell case (#1235)
       
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        "Mental Deficiency Pedigree," a multigenerational study of a rural family by the British National Association for the Feebleminded, multiple pages (#2213)
       
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        "Mental disorders in twins," 3rd International Eugenics Conference (#1088)
       
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        "Mongolian idiocy," flash cards on genetic defects (#742)
       
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        "Most immediate blood-kin of Carrie Buck.  Showing illegitimacy and hereditary feeblemindedness." (#1013)
       
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