Encyclopedias

Encyclopedia Britannica Online (UMD only)
General encyclopedia with over 73,000 articles. Includes Encyclopedia Britannica, Britannica Student Encyclopedia, and Britannica Elementary Encyclopedia.

Encyclopedia.com 
Provides users with more than 57,000 updated articles from the Columbia Encyclopedia, Sixth Edition. Articles are enhanced with links to newspaper and magazine articles as well as pictures and maps.

Oxford Art Online (UMD Only)
Provides access to the entire text of The Dictionary of Art (34 v.) and The Oxford Companion to Western Art, with ongoing additions of new and updated articles, thumbnail art images and line drawings, and extensive image links. 

Oxford Music Online (UMD Only)
Full text of the New Grove Dictionary of Music and Musicians, second edition (2001), the New Grove Dictionary of Opera (1992), and The New Grove Dictionary of Jazz, second edition (2002). Articles that have been updated since their appearance in print are date-stamped in the upper right corner of the screen. 

Wikipedia
Web-based, self-referential, multi-language, free-content encyclopedia written collaboratively by volunteers. Contains approximately 1.6 million articles.