• Darwin Archive | 'Descent of man': portfolios | 'Descent of man': first edition, 1871, and 'Insectivorous Plants' | 'Descent of man' first edition: correspondence and material relating to birds | 'Descent of man' first edition: material relating to birds, 1860s | Birds-137 Note, 1861-04-19 | Except man Birds the most aesthetical..., 1861-04-19

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