Schwerer Gustav - The Greatest, And Most Useless Gun Ever Put Into Combat - Military-wiki

Gustav fired a total of 48 shells at Sevastopol, most of which were aimed at Soviet fortresses. Berlin threw away more 1,000 tons of steel for 48 shots.

Schwerer Gustav - Rail Super Gun (Behemoth)

Toy soldiers and real battles: The Schwerer Gustav scale model at the Dresden Bundeswehr Military History Museum

File:Schwerer Gustav (36556135981).png - Wikipedia

Is there a reason you can't put a 1000mm cannon on a tank? - Quora

Artillery - Wikipedia

Korth PRS Automatic Pistol: German Quality (And Price!)

What was it like for the enemy to get shot at by the Gustav gun? - Quora

Schwerer Gustav: Largest Gun Mankind Has Ever Built

Schwerer Gustav: Largest Gun Mankind Has Ever Built

The Largest anti-tank gun ever fired. : r/Warthunder

Schwerer Gustav: Biggest Gun Ever Used in Combat

These are the 6 largest guns ever used in combat