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The U-boat War in World War Two (Kriegsmarine, 1939-1945) and World War One (Kaiserliche Marine, 1914-1918) and the Allied efforts to counter the threat. Over 40.000 pages on the officers, the boats, technology and the Allied efforts to counter the U-boat threat.
Nomenclature of all WW2 German Submarine Types
Defeating the Kaiser's U-boats: British Anti-Submarine Weapons, 1914-1918
What the postman brought today (Armorama) - Armor/AFV - KitMaker Network
U BOATS NAZI GERMANY WORLD WARTIME SUBMARINES U BOOT UNTERSEEBOOT
A German U-boat's watery grave off North Carolina - CBS News
German U-boats from WWI and WWII seem to look the same and be used the same. What important advances in submarine technology and tactics happened between the two world wars? - Quora
Exclusive: Wreck of fabled WWI German U-boat found off Virginia
U-boat, German Submarine Warfare in WWI & WWII
Type XB U-Boats (1941)
Canada's Naval History - Objects and Photographs
Learn from Fleet Boat Development Naval History Magazine - February 2020, Volume 34, Number 1
What the postman brought today (Armorama) - Armor/AFV - KitMaker Network
The U-Boats of World War Two - Weapons and Warfare
PAPERMAU: WW2`s German U-Boat Type VII C Submarine - by U-Don Factory