If a specific book, journal article, or other non-print resource that you need for your studies is not available in the CMU Libraries, you may request them via Documents on Demand.
You can renew your books and other library materials online, if you cannot come to the library in person. Please visit the above link for more details. Just go to the My Library Account link located in the left column of this page, sign in with your global id and password, and renew the books you need to.
The OED is widely regarded as the most significant dictionary of the English language, offering the meaning, history, and pronunciation of more than 600,000 words —past and present— from across the English-speaking world.