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OnePetro

OnePetro is an online library of technical literature for the oil and gas exploration and production (E&P) industry. With contributions from 18 publishing partners and providing access to over 160,000 items, OnePetro.org is the definitive resource on upstream oil and gas.

Opposing Viewpoints

Brings together all the information that's needed to fully understand an issue: pro and con viewpoint articles, reference articles, magazines, academic journals, and newspapers, primary source documents, government and organizational statistics, multimedia and more.

Oxford Art Online

Provides Web access to the entire text of The Dictionary of Art (1996, 34 vols.) plus extensive image links and all the sophisticated search advantages possible with an online reference source.

Oxford Music Online

An integrated music resource on the web, including the full text of The New Grove Dictionary of Music and Musicians (second edition), The New Grove Dictionary of Opera and The New Grove Dictionary of Jazz (second edition).

Oxford Reference

Contains about 100 dictionary, language reference, and subject reference works published by Oxford University Press.