• Darwin Archive | 'Origin of Species': portfolios I | Materials for 'Natural Selection' chapter 4: 'Variation under nature' | NS I Chap 4-30 Note, Notebook C: 159-160 (excised page), 1809-01-01 - 1882-04-30 | C 159e, 1838-05-01 - 1838-06-30

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