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.

Artillery - Wikipedia

Schwerer Gustav, When the Cold Breeze Blows Away Wiki

United States WW2 Era Rail Gun : r/HumanForScale

Jacob Rosenfeld, The Wolfenstein Fanon Wiki

Schwerer Gustav: Largest Gun Mankind Has Ever Built

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

MWO: Forums - Atlas Vs. Ratte (1000 Ton German Tank)

Was the Gustav gun successful, and was it destroyed? If it was, how? - Quora

Schwerer Gustav Super Cannon - The Most Useless Weapon Ever Made

German units, Gates of Hell: Ostfront Wiki

Schwerer Gustav - Rail Super Gun (Behemoth)