• Darwin Archive | 'Descent of man': portfolios | 'Descent of man': first edition, 1871, and 'Insectivorous Plants' | 'Descent of man' first edition: letters and material relating to fish and reptiles, 1860 - 1870 | Descent Portfolios 1st edn, Sexual Selection: Fish & Reptiles | Fish & Reptiles-7 Note, 1869-09-01 - 1869-10-31 | Gunther / are the sexes known to differ..., 1869-09-01 - 1869-10-31

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