The Borderlands Encyclopedia
A Digital Educational Resource on Contemporary United States-Mexico Border Issues (University of Texas at El Paso).
From Microsoft Network
A free service from the subscription service "Electric Library." More than 17,000 articles from the Concise Columbia Electronic Encylopedia(3rd ed) have hyperlinks to related articles as well as references to articles within the Electric Library database.
Musical Heritage Network Instrument Encyclopedia
For each instrument, the encyclopedia offers history, design information, and bibliography, along with brief discussions of musical works featuring them.
A dictionary/encyclopedia about personal computers