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Iron Coffins: A Personal Account Of The German U-boat Battles Of World War II: Werner, Herbert A.: 8601409917313: Amazon.com: Books
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Forgotten Fights: USS Buckley Duels U-66 | The National WWII Museum | New Orleans
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Permission to Come Aboard — Four Surviving WW2 U-Boats You Can Actually Visit - MilitaryHistoryNow.com
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Permission to Come Aboard — Four Surviving WW2 U-Boats You Can Actually Visit - MilitaryHistoryNow.com
U-boat campaign - Wikipedia
