- Books of Charles Darwin - On-line literature library of Darwin's works, including "The Voyage of the Beagle," "The Origin of the Species," and "The Descent of Man."
- Coral Reefs - Plain text file at Project Gutenberg.
- Darwin and Darwinism - The full text of many of Charles Darwin's key works.
- Darwin Correspondence Project - Exists to publish the definitive edition of letters to and from Charles Darwin, the most influential naturalist of the 19th century.
- Descent of Man - From the Literature Network, the complete text indexed by chapter. Includes a search feature.
- Effects of Cross and Self Fertilisation in the Vegetable Kingdom - Plain text file at Project Gutenberg.
- Free Online Library - The Voyage of the Beagle - Read about the voyage of Darwin on the HMS Beagle between 1831 and 1836.
- Geological Observations on South America - Plain text file at Project Gutenberg.
- Journal of Researches - Complete e-text of Beagle journals. 1871 edition (Image, text, PDF).
- Life and Letters of Charles Darwin, Volume 1 - Plain text file at Project Gutenberg.
- Life and Letters of Charles Darwin, Volume 2 - Plain text file at Project Gutenberg.
- More Letters of Charles Darwin, Volume 1 - Plain text file at Project Gutenberg.
- More Letters of Charles Darwin, Volume 2 - Plain text file at Project Gutenberg.
- The Autobiography of Charles Darwin - Plain text file at Project Gutenberg.
- The Complete Work of Charles Darwin Online - A single site for all of Darwin's published and unpublished writings including a major catalogue of his every publication and manuscript in the world. Fully searchable.
- The Descent of Man - Plain text file at Project Gutenberg.
- The Different Forms of Flowers on Plants of the Same Species - Plain text file at Project Gutenberg.
- The Expression of the Emotions in Man and Animals - Plain text file at Project Gutenberg.
- The Formation of Vegetable Mould - Plain text file at Project Gutenberg.
- The Movements and Habits of Climbing Plants - Plain text file at Project Gutenberg.
- The Variation of Animals and Plants Under Domestication, Volume 1 - Plain text file at Project Gutenberg.
- The Variation of Animals and Plants Under Domestication, Volume 2 - Plain text file at Project Gutenberg.
- The Voyage of the Beagle - Plain text file at Project Gutenberg.
- The Voyage of the Beagle - From the literature network, the complete text indexed by chapter. Includes a search feature.
- Volcanic Islands - Plain text file at Project Gutenberg.
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