• 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 5-29 Abstract, 1855-01-01 - 1882-04-30 | Cooper (Miss) 'Journal of a naturalist in U States' 1855: 89, 118, 120, 140, 142, 231-233, 1855-01-01 - 1882-04-30

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