• Darwin Archive | 'Natural Selection': draft chapters, 1856-1858 | 'Natural Selection': material relating to chapter 4 , 1856 - 1857 | 'Natural Selection': chapter 4, second part, draft and fair copy sent to J.D. Hooker | 'Natural Selection,' chap 4, 2nd part, draft, 1858-04-14 - 1858-06-12 | Ms p 36

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