- Islandora Repository
- Text Collection
- An Annotated Calendar of the Letters of Charles Darwin in the Library of the American Philosophical Society
- Alfred Russel Wallace to Sir Charles Lyell, 1864 February 9
![Charles Darwin to "Dear Sir," [J. X. R. Caspary], [1861-1869] December 26](https://diglib-legacy.amphilsoc.org/islandora/object/text%3A250729/datastream/TN/view)
- Charles Darwin to "Dear Sir," [J. X. R. Caspary], [1861-1869] December 26
- Charles Darwin to Charles Lyell, 1837 December 19
- Charles Darwin to Charles Lyell, 1838 August 9
- Charles Darwin to Charles Lyell, 1838 September 13
- Charles Darwin to Charles Lyell, 1839 January
- Charles Darwin to Charles Lyell, 1840 February
- Charles Darwin to Charles Lyell, 1841
- Charles Darwin to Charles Lyell, 1841
- Charles Darwin to Charles Lyell, 1841
- Charles Darwin to Charles Lyell, 1841 July 6
