New Jersey Office of the Attorney General
Division of Consumer Affairs
Office of Consumer Protection
Regulated Business Section
124 Halsey Street, 7th Floor
P.O. Box 46016
Newark, NJ 07101
Telephone: (888) 656-6225
http://www.njconsumeraffairs.com/contractor.htm 

Bureau of Alcohol, Tobacco, Firearms, and Explosives

http://www.atf.gov

Department of the Interior

http://www.doi.gov

Department of Transportation

http://www.dot.gov

Explosives Academy 

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Occupational Safety and Health Administration