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If anyone is now itching to read a Jack London novel, Standard Ebooks has a selection (including The Call of The Wild) for free: https://standardebooks.org/ebooks/jack-london/

All his works are available on Project Gutenberg for free: http://www.gutenberg.org/ebooks/author/120.

Standard ebooks fetches from Gutenberg and other sources and clean them up before publishing them it seems.