• Darwin Archive | 'Cross and self fertilisation': portfolios, 1840s-1876 | 'Cross and self fertilisation': experimental results, [1840s]-1875 | Letter from Sir Francis Darwin to Charles Robert Darwin; written at Machynlleth, 1873-01-01 - 1873-08-14 | Sir Francis Darwin to Charles Robert Darwin, 1873-01-01 - 1873-08-14

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