• Darwin Archive | 'Origin of Species': portfolios I | Materials for chapter 3: 'On...organic beings occasionally crossing', 1841-01-01 - 1872-12-31 | Notes on Fertilisation of Flowers Part 3A (1860-1872) DAR 49 | NS I Chap 3-105 Printed Material, 1871-04-27 | 'Nature' 3: 510, 1871-04-27

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