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外文书籍下载网站，
Bookyards
https://www.bookyards.com/en/welcome
Booksee
https://en.booksee.org/
Pdf Drive
https://www.pdfdrive.com/
Freebookcentre
http://www.freebookcentre.net/
DigiLibraries
https://digilibraries.com/
Forgotten Books
https://www.forgottenbooks.com/en
频道 @blog4563
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