Texas Residential Construction Commission
P. O. Box 13144
Austin, TX 78711
Telephone: (877) 651-TRCC
http://www.trcc.state.tx.us/.

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