• 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 3-128 Note, 1809-01-01 - 1882-04-30

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