• 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 5-60 Printed Material, 1868-01-01 - 1868-12-31 | [title unknown] 'Land and Water': 33, 1868-01-01 - 1868-12-31

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