For more, see the complete Web Citations Index.

That limitation will soon be a thing of the past: the Britannica in its entirety (Propaedia, Micropaedia, Macropaedia and hundreds of new entries not contained in any print edition) is available at Britannica Online. Here the circle-of-learning metaphor really works: each powerful search done on the site creates a new center of information out of which all other knowledge radiates. The Britannica, one has to conclude, was made for the digital age.

Vast and labyrinthine, Britannica Online is as mind-bogglingly suggestive as, say, a story by Jorge Luis Borges -- and indeed the site is cause, as is Borges's fictional Library of Babel, for both "extravagant happiness" and "excessive depression." All of the Britannica's collected knowledge resides on a single Web site. That one site can of course be included as a mere link on a more comprehensive site (of all encyclopedias, for example, in all languages), which itself can be subsumed into a knowledge base even larger, and on and on . . . until finally one arrives at the Web Site of All Knowledge -- which, like Borges's Library, is nothing less than the unlimited and circular universe, whose center is everywhere and whose circumference is unknowable.