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- The U-boat Wars 1939-1945 (Kriegsmarine) and 1914-1918 (Kaiserliche Marine) and Allied Warships of WWII - uboat.net
- U-boat, submarine, boats, technology, XXI, VIIC, IX, II, XIV, XXIII, Uboote, Unterseeboote, aircraft, escorts, Kriegsmarine, German n**y, U-boote.
- The U-boat War in World War Two (1939-1945) and World War One (1914-1918). Over 30,000 pages on the officers, the boats, technology and the Allied efforts to counter the U-boat threat.
