Also:

• https://annas-archive.org/
• https://www.myanonamouse.net/
• https://www.smartquantai.com/
• https://wikipedialibrary.wmflabs.org/
• https://unpaywall.org/
• https://nicotine-plus.org/ (Some pdfs/ebooks, mostly for audiobooks)
• https://fmhy.pages.dev/
• http://libgen.lc/
• https://thepiratebay.org/
• https://libgen.gs/
• https://katcr.to/
• https://openstax.org/
• https://open.umn.edu/opentextbooks/
• https://scholarworks.gvsu.edu/books/
• http://www.pdfsearchengine.info/
• https://bookboon.com/en
• http://www.textbooksfree.org/
• https://www.gutenberg.org/
• http://www.avaxhome.co/
• https://forum.mobilism.org/viewforum.php?f=106
• https://www.reddit.com/r/Piracy/comments/3i9y7n/guide_for_finding_textbooks/
• https://www.google.com “nameofyourbook site:vk.com file:pdf”
• https://www.pdfdrive.com/
• https://b-ok.cc
• http://libgen.li/
• https://thepiratebay.org/search/textbook/0/99/0
• IRC: irc.irchighway.net:#ebooks
• Telegram: https://www.reddit.com/r/libgen/comments/lq3oo1/active_telegram_bot_for_downloading_libgen_ebooks/