• Darwin Archive | 'Cross and self fertilisation': portfolios, 1840s-1876 | 'Cross and self fertilisation': experimental results, [1840s]-1875 | [of 'Descent'] pp 62, 56 [published vol 2 pp 297, 293], 1870-01-01 - 1882-04-30 | [of 'Descent'] p 62 [published vol 2 p 297], 1870-01-01 - 1882-04-30

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