• Darwin Archive | 'Natural Selection': draft chapters, 1856-1858 | 'Natural selection': further material relating to chapter 4, 1856-1857 | Grisebach / Genera with 6 species & upwards / Genera with 5 species / Genera with 4 species & downwards (table), 1809-01-01 - 1882-04-30 | Grisebach / Genera with 6 species & upwards / Genera with 5 species / Genera with 4 species & downwards (table), 1809-01-01 - 1882-04-30

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