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:max_bytes(150000):strip_icc()/U-boat-sinking-a-troop-transport-by-Willy-St-wer-57e942943df78c690f30abc8.jpg "Unrestricted Submarine Warfare and How It Caused Germany to Lose WWI")
Unrestricted Submarine Warfare and How It Caused Germany to Lose WWI
Did Sea Monsters Really Sink a German U-Boat? - Ship Hits the Fan Podcast - Rooster Teeth
U.S. Army Service, Campaign Medals and Foreign Awards Information
Raiders of the Deep: U-boats of the Great War, 1914-18 – Compass Games
The choicest of their kind' – Harvard Gazette
Unrestricted U-boat Warfare | National WWI Museum and Memorial
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Submarine Photo Index
World War One German U-Boat Badge, Hollow-back Version
United States Navy and World War I: 1914–1922
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