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80 cm Kanone (E) - Internet Movie Firearms Database - Guns in

Schwerer Gustav - Rail Super Gun (Behemoth)

Artillery Ammunition Comparison (by Caliber)

Battle Machines - Size matters! 😉 ~Clorox.

Could we make a round for the 80cm Gustav Gun with a nuclear warhead, and how big could the explosion be? - Quora

Weapons Of Great Wars - Schwerer Gustav was the name of a German 80 cm railway gun. It was the largest-calibre rifled weapon ever used in combat, the heaviest mobile artillery piece

TankHistoria - Schwerer Gustav was a German 80-centimetre (31.5 in) railway gun. It was developed in the late 1930s by Krupp in Rügenwalde as siege artillery for the explicit purpose of destroying

Schwere Gustav Aircraft of World War II - Forums

Big Shots – History's Largest Cannons, Mortars and Super Guns

Schwerer Gustav and Dora - Planet Weapon