• Darwin Archive | 'Origin of species': portfolios II | Hybridism, sterility, 1841-1857 | NS II Hybridism: Pigeons | NS II Hybridism, sterility [and pigeons]-137 Note, 1840-01-01 - 1882-04-30 | Barb. Black ♂, 1840-01-01 - 1882-04-30

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