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8.8 cm SK C/35 naval gun - Wikipedia
8.8 cm/45 (3.46") SK C/35 - NavWeaps
Japan 40 cm/45 (15.7") Type 94 - NavWeaps
BL 18-inch Mk I naval gun - Wikipedia
Deck gun - Wikipedia
U-boat Deck guns - Technical pages - German U-boats of WWII ...
What calibers were WWII submarine deck guns? - TheGunZone
German U-Boat Deck Guns - 88mm & 105mm Specification
The Yamato – Japan’s Behemoth With 18 Inch Guns - NavalHistoria
Deck gun - WikiMili, The Best Wikipedia Reader