غواصة يو-91

مراجع
  1. Helgason, Guðmundur، "WWI U-boats: U 91"، German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net، اطلع عليه بتاريخ 25 يناير 2010.
  • بوابة ألمانيا
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