Encyclopedias

Britannica Online
Electronic, multimedia version of well-known encyclopedia with links to subject-related Web sites.  

Gale Virtual Reference Library
Selected reference books, including subject-specific encyclopedias, biographies, social studies and histories.

Internet Encyclopedia of Philosophy
Entries dealing with all sorts of philosophical topics.

Probert Encyclopaedia of Ships
Merchant, military and all things nautical

The Probert Encyclopaedia