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The Complete Works of Charles Darwin Online: Table of contents, bibliography of The Variation of Animals and Plants under Domestication: The web pages provide links to text and images of all editions of The Variation of Animals and Plants under Domestication, including translations into French, German, Italian, and Polish.

Darwin Correspondence Project Home Page, University Library, Cambridge.

The text of the second edition of The Variation of Animals and Plants under Domestication can be downloaded from Project Gutenberg: Volume 1, Volume 2.