Works Cited

http://www.travelchinaguide.com/intro/focus/weaponry-post.htm

http://en.wikipedia.org/wiki/Smoothbore

http://en.wikipedia.org/wiki/Mortar_(weapon)

http://www.nps.gov/archive/gett/soldierlife/artillery.htm

http://www.thefinertimes.com/Weapons-of-War/weapons-used-in-the-war-of-1812.html

http://www.firstworldwar.com/atoz/bigbertha.htm

http://en.wikipedia.org/wiki/14%22/50_caliber_railway_gun

http://en.wikipedia.org/wiki/Quadratic_equation#Quadratic_formula

http://www.google.com/images