• Darwin Archive | 'Origin of Species': portfolios I | 'Natural Selection' chapters 5 and 6, portfolios on Seeds and Flowers (Cattell Catalogues) and 'Habits of Bees': notes on fertilisation of flowers | Materials for chapter 5: 'Struggle for existence' | NS I Chap 5-76 Letter, 1871-04-25 | Friedrich Theodor Köppen to Charles Robert Darwin, 1871-04-25

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