Columbia Encyclopedia This free online encyclopedia contains over 50,000 entries and more than 84,000 hypertext cross-references covering a wide range of research and reference topics. The Columbia Encyclopedia is one of the most complete and up-to-date electronic encyclopedias ever produced. (from the website)

The Catholic Encyclopedia proposes to give its readers
full and authoritative information on the entire cycle

of Catholic interests, action and doctrine. 

Questia’s FREE encyclopedia includes more than 52,000 articles from the Columbia Encyclopedia, Sixth Edition. Each article is enhanced with links to Questia’s premium reference library of 77,000 full-text books and 4,000,000 journal, magazine, and newspaper articles. (from the website) 

Explore the updated online encyclopedia from Encyclopaedia Britannica with hundreds of thousands of articles, biographies, videos, images, and web sites. (from the website) 

The PAE provides information about the Library of Congress’s unsurpassed collections of scores, sheet music, audio recordings, films, photographs, and other materials. Users can find digitized items from the collections; special Web presentations on topics and collections; articles and biographical essays; finding aids to collections; databases for performing arts resources. (from the website)