iTools
www.itools.com/research -links to Encarta, Britannica, Columbia and xrefer Encyclopedias

Surfable Books
www.surfablebooks.com -is both a World Book encyclopedia and a science encyclopedia.

Encarta Encyclopedia
www.encarta.msn.com/encnet/refpages

Columbia Encyclopedia
www.bartleby.com/65

The Canadian Encyclopedia
www.thecanadianencyclopedia.com