Not sure if this is PD. Here's a site of Charles Darwin's collected works:
http://darwin-online.org.uk/
Darwin Online Collection.
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If you meet anyone called Larsen E. Pettifogger do not trust his legal advice.
All of Darwin's original publications should be PD with the latest being published in 1909. This site also has a lot of translations into other languages released much later that may not be PD though.