• Darwin Archive | 'Power of movement': draft chapters, 1877-1882 | 'Power of Movement': drafts of chapters 9-12., 1879 - 1882 | Draft of Chapters 11 and 12, 1879 - 1882 | Chap. 12, 'Summary and concluding remarks' (partial), 1879-01-01 - 1882-04-30 | Ms p 40

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