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Charles Darwin Letters - UBC Library Open Collections
Darwin Correspondence Project – RIDE
The Foundation of the Origin of Species: Two Essays Written in 1842 and 1844 by Charles Darwin (Cambridge Library Collection - Darwin, Evolution and Genetics): 9781108004886: Darwin, Charles, Darwin, Francis: Books
Epsilon: building a collaborative digital framework for c19 letters of science
Charles Darwin Letters - UBC Library Open Collections
Darwin Correspondence Project – RIDE
Darwin Correspondence Project – Cambridge University Library Special Collections
Darwin, Francis ed. 1887. The life and letters of Charles Darwin, including an autobiographical chapter. vol. 3. London: John Murray.
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Charles Darwin Letters - UBC Library Open Collections
On the Origin of Species - Wikipedia
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On the Origin of Species Darwin Correspondence Project