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Deutsche Uboote seit 1956: Karr, Hans: 9783613037083: Amazon.com: Books
Deutsche Uboote seit 1956: Karr, Hans: 9783613037083: Amazon.com: Books
The Baltimore Sabotage Cell: German Agents, American Traitors, and the U-boat Deutschland During World War I: Messimer, Dwight R.: 9781591141846: Amazon.com: Books
File:Unterseeboot U-32.jpg - Wikimedia Commons
Deutsche Marine: Die Schiffe der Bundesmarine 1956-1990: Karr, Hans: 9783613037731: Amazon.com: Books