• 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 1A (1840-1844) DAR 49 | NS I Chap 3-20 Note, 1842-06-08 | Fertilisation of Flowers 1842-23v, 1842-06-08

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