If you want download a book for free, this is the first site you need to visit. If you can’t find it here, you cannot find it freely on any where.
It’s better than Pdfdrive.com.
It has 10,870,978 books.
It’s the world’s largest e-book library.
It is called as Z-Library.
Here is the link: Electronic library. Download books free. Finding books (book4you.org)