• Darwin Archive | Correspondence, largely with Darwin family members, and fragments or drafts relating to 'Origin' and 'Cirripedia' | Origin draft, Difficulties Section, 1858-10-22 - 1858-11-13 | Sect VI Means of transition, 1858-10-23 - 1858-11-13 | Ms p 209v (insert B), 1858-10-23 - 1858-11-13

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