Census

Census.gov
US Census data and tabulations

Chemicals, HAZMAT & Industrial Hygiene

NIOSH Pocket Guide to Chemical Hazards
The definitive listing of hazardous chemicals.

EPA Hazardous Chemical Database
A voluminous listing of chemicals that the EPA currently monitors, the really nasty stuff. Use its search engine or download the entire listing.

Computers & Internet

Computers & Internet ... Glossaries & Dictionaries
Looking for the definition of a term in a particular subject can be difficult and time consuming. That's where the Glossarist can help you look.