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World Wars: The Battle of the Atlantic: The U-boat peril - BBC
Battle of the Atlantic | Combatants, Significance, & Facts
Battle of the Atlantic - Wikipedia
Battle of the Atlantic - NHHC
Battle Of The Atlantic: How Did The Allies Defeat The U-Boat …
Atlantic U-boat campaign of World War I - Wikipedia
Turning Point in the Atlantic - U.S. Naval Institute
What You Need To Know About The Battle Of The Atlantic
BBC - History - World Wars: Battle of the Atlantic
U-boats - History Learning Site