Some useful sites to review the Department of Transportation regulations are listed below:

Chemical Transportation Emergency Center
Phone: 1-800-262-8200
http://www.chemtrec.org/Chemtrec/

Office of Hazardous Materials Safety
http://hazmat.dot.gov/regs/rules.htm

Office of Hazardous Materials Safety CFR 49 Ch. I Menu
http://www.myregs.com/dotrspa/