 | occupations and, 40
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 | Fetus and testosterone, 1115
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 | degree of masculinity, both sexes, 1113
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 | effect on mother, 1415
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 | gender and, 11
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 | genetic or congenital abnormalities X, Y chromosomes, 3839
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 | homosexuality and androgens in utero , 121
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 | sex-ratio of children and level in mothers, 14
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 | twins, boy-girl, and, 13
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 | Fiedler, Leslie, 160
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 | Fielden, Julie, 9091, 129130
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 | Fighting
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 | contemporary, large tools and heavy equipment, 35
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