All of Darwin's published work is available here, as well as selected private papers and manuscripts as well as supplementary materials.
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KEY DATABASES
For searching with precision, try one of these databases. They contain a combination of full text articles (ready to read online) and citation information about articles, book chapters, or books.
Organismal biology, ecology, and environmental science, in 3 sections: Biology Digest (general), 1989 to present; Biological Sciences (research journals) 1982 to present; and Plant Science, 1994 to present.