In my experience, kind of what other people are saying.
LibGen is very helpful, although it doesn't always have what you might be looking for.
RE: Best place to download e-books?.
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I've also used Textbook Nova, which can be pretty useful as well.
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Ebookee has some things, but I've found it to be hit-or-miss.
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I haven't really used Project Gutenberg much myself, but they do hold a large repository of books of varying types.
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Some of this links hopefully will direct you to what you're looking for. Good luck!