• 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 (1) | Sexes (1)-34 Letter, 1869-06-21 | Robert Elliot to George Cupples, 1869-06-21

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