State of Maryland  
Home Improvement Commission 
500 North Calvert Street 
Baltimore, MD 21202

Telephone:  (410) 230-6176  
http://www.dllr.state.md.us/license/home_imprv/hicintro.html 

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 

Newsletter

Occupational Safety and Health Administration