• 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, fair copy and notes | Wide-ranging, common and much diffused species tend most to vary, 1809-01-01 - 1882-04-30 | Ms p 31

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