• Darwin Archive | 'Cross and self fertilisation': portfolios, 1840s-1876 | 'Cross and self fertilisation': experimental results, [1840s]-1875 | Hoffmann 'Bestimmung der Species', 1869-01-01 - 1882-04-30 | Hoffmann 'Bestimmung der Species', 1869-01-01 - 1882-04-30

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