Darwin Correspondence Project, University of Cambridge
Read and search the full texts of more than 9,000 of Charles Darwin’s letters, and find information on 6,000 more. Discover complete transcripts of all known letters Darwin wrote and received up to the year 1873.
Darwin Manuscript Project
Charles Darwin's surviving 46,032 pages of scientific manuscripts—his original notes, notebooks, and drafts—contain the crucial documentary evidence for the birth and maturation of his theory of evolution by means of natural selection. We currently offer digital access to all of the 34,643 folios that deal directly with the theory of evolution.