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Type IX submarine - Wikipedia
German Type IX U-Boat - history, specification and photos
Type IX - Deutsches U-Boot-Museum
Type IX U-Boats - Naval Encyclopedia
Type IX long range boats - U-boat Types - German U-boats of …
Type IXA submarine - Wikipedia
Type IX U-boat - WW2 Weapons
Interior layout of a German Type IXC U-boat
U-boat Types - Deutsches U-Boot-Museum
The Type IX U-boat U-43 - German U-boats of WWII - uboat.net