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File:German WW2 U-boat submarine U-586 Polar bear emblem of 11 U-Flottille 11th Flotilla Bergen Eismer Arctic Ocean Miniature models Zifferblatt Maschinentelegraph U-boot Hagenuk chadburn etc Lofoten krigsminnemuseum Museum Norway 2022-02-2.jpg - Wikimedia
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Grey Wolf: U-Boat Crewman of World War II (Warrior): Williamson, Gordon, Pavlovic, Darko: 9781841763125: Amazon.com: Books
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