Encyclopedias
- Artcyclopedia -- Index to online works of artists who are represented in arts museums with a focus on fine art painting and sculpture. Other artistic media can be found, but not in depth.
- Autopedia: the Automotive Encyclopedia -- Provides links for automotive-related information.
- Catholic Encyclopedia 1913
- Connected: an Internet Encyclopedia
- Encyclopedia Astronautica -- International space flight information.
- Encyclopedia.com
- Encyclopedia Mythica -- An Encyclopedia of mythology, folklore, mysticism, and more.
- Encyclopedia of Economic and Business History
- Encyclopedia of Psychology -- Links to psychology websites.
- Encyclopedia Smithsonian -- Information often requested at the Smithsonian Institution.
- Internet Encyclopedia of Philosophy
- JewishEncyclopedia -- Complete contents of the 12-volume Jewish Encyclopedia, which was originally published between 1901-1906.
- Stanford Encyclopedia of Philosophy -- Each entry is maintained by experts in the field.
- SYMBOLS.com -- Encyclopedia of Western Signs and Ideograms -- Online version of Thought Signs by Carl G. Livingman (1975). Over 2,500 Western signs with a graphic or word index.
- Wikipedia
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