• Darwin Archive | Papers of Leonard Darwin, bulk: [1850s] - 1943 | Letters of Leonard Darwin to his mother, Emma Darwin, [1850s] - 1896 | Letters to Emma Darwin, 1874 - 1875 | Letter from Leonard Darwin to Emma Darwin née Wedgwood; written at Yosemite Valley (California), 1875-04-21

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Part of the Cambridge University Library Repository