67 MORE WEBSITES THE INTERNET FORGOT TO TELL YOU ABOUT
http://refseek.com — Google for students, no ads, no junk
http://core.ac.uk — 250M+ research papers, all free and legal
http://doaj.org — every open-access journal in one place
http://openstax.org — free, peer-reviewed college textbooks
http://worldcat.org — find any book in a library near you...