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Originally Posted by Joe563
Books that are in the public domain such as those listed at the Project Gutenberg website are free. Books that are in the public domain can also be sold by book publishers. Hopefully, publishers are also adding something that makes it worth the extra cost such photos, diagrams and better indexes and tables of content.
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The "paid" versions of the classics (eg Penguin Classics editions) will have footnotes, an introduction, appendices, etc. Well worth paying for if you're studying the text, as opposed to simply reading it.