Virtual Reference
Online resources that organize information
by subject categories or library classifications.

Digital Librarian
Internet Public Library's Reference Center
Librarians' Index to the Internet
LibrarySpot
National Archives' Research Room
British Columbia's Virtual Reference Desk
Purdue University's Virtual Reference Desk
Ramapo Catskills (NY) Library's DeskRef
RefDesk.com
Repositories of Primary Sources
Toronto Public Library's Virtual Reference Library
UC-San Diego

Webrary, Morton Grove (IL) Public Library
WWW Virtual Library, Indiana University