What does U-BOAT mean? - U-BOAT Definitions | Abbreviation Finder
Difference between Submarine and U-boat | Submarine vs U-boat
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U-BOAT - Significato e sinonimi di U-boat nel dizionario inglese
What does U-boat mean? - Definition of U-boat - U-boat stands for Unterseeboot. By AcronymsAndSlang.com
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U-boat definition and meaning | Collins English Dictionary