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For sheer volume you can't beat Google - literally millions of free PD books.
Now, they're all OCR scanned and not edited at all, but you can certainly find things there you can't find anywhere else. Just be prepared to read around OCR errors.
To me it's better than archive.org or Open Library - I find most of those books to be nearly unreadable. Google's OCR conversion is better, IMO.
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