• Darwin Archive | 'Cross and self fertilisation': portfolios, 1840s-1876 | 'Cross and self fertilisation': experimental results, [1840s]-1875 | (Professor Hoffmann of Giessen on Phaseolus) 'Nature' 9: 427, 1874-09-24 | (Professor Hoffmann of Giessen on Phaseolus) 'Nature' 9: 427, 1874-09-24

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