==External links==* Class 1 Hazmat Placards* Blaster Exchange - Explosives Industry Portal* Explosives info* Explosives GlobalSecurity.org* Journal of Energetic Materials* Military Explosives* The Explosives and Weapons Forum* UN Hazard Classification Code at GlobalSecurity.org* Why high nitrogen density in explosives?
8 November 2004. p 52, 91, 182.