Britannica Online offers the 32 volume Encyclopaedia Britannica (updated every two weeks)
Credo Reference provides access to a large number of encyclopedias, dictionaries, thesauri and other reference books. Subjects covered include art, biography, history, literature, music, religion, and science and technology. Includes a spider map of related subjects
Standard, academic reference sources on a variety of topics. Some sources in this collection are better for historic than for current information.