Online scholarly articles, free of charge and free of most copyright/licensing restrictions. Often peer-reviewed and made available at the discretion of the author.
If the OCCC Library does not have the book or article that you need, you may be able to use Interlibrary Loan (ILL).
What is ILL?
ILL links libraries across the nation for sharing resources, based on the principles that no single library can acquire everything and that furthering knowledge is in the public interest.