• Darwin Archive | 'Origin of species': portfolios II | Hybridism, sterility, 1841-1857 | Letter from William Yarrell to Charles Robert Darwin; written at [place unstated], 1838-12-13 - 1838-12-21 | William Yarrell to Charles Robert Darwin, 1838-12-13 - 1838-12-21

• Access on Cambridge Digital Library

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