• Darwin Archive | 'Cross and self fertilisation': portfolios, 1840s-1876 | 'Cross and self fertilisation': experimental results, [1840s]-1875 | Letter from Sir Joseph Dalton Hooker to Charles Robert Darwin; written at Kew; incomplete, rest at See DAR 209.6: 205, 1873-08-30 | Sir Joseph Dalton Hooker to Charles Robert Darwin, 1873-08-30

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