Code of Federal Regulations	http://law.house.gov/cfr.htm
Duke University Occupational and Environmental Medicine	http://dukeoccmed.mc.duke.edu/
CDC Homepage	http://www.cdc.gov/
OSHA Regulations	http://www.osha.gov/SLTC/lead/
EPA Homepage	http://www.epa.gov/
NIOSH Homepage	http://www.cdc.gov/niosh/homepage.html
Envirolink	http://envirolink.org