• 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-48 Note, 1868-03-17 | Fusion / ...the two eyes on the tail-coverts..., 1868-03-17

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