• Darwin Archive | 'Descent of man': portfolios | 'Descent of man': first edition, 1871, and 'Insectivorous Plants' | 'Descent of man' first edition: notes on proportion of sexes, and 'Insectivorous plants': correspondence | Descent Portfolios 1st edn, Sexual Selection: Proportion of Sexes (2) | Sexes (2)-9 Letter, 1868-02-28 | [Robert Russell] to Charles Robert Darwin, 1868-02-28

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