General Reference Resources
- American Fact Finder
- Answers Library
- FedStats
- Information Please Almanac
- iTools
- Martindale’s Reference Desk
- The Open Library
- Refdesk.com
- Resource Discovery Network
- Statistical Abstract of the U.S.
- Virtual Reference Shelf
- Wikipedia
- Wikipedia Vision (see where Wikipedia edits are coming from in real time)
- WorldCat