• Darwin Archive | 'Origin of Species': portfolios I | Materials for 'Natural Selection' chapter 4: 'Variation under nature' | NS I Chap 4- 94 Abstract, 1809-01-01 - 1882-04-30 | Webb & Berthelot 'Phytographia Iles Canaries' 3: 172, 1809-01-01 - 1882-04-30

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