Enigma U-boats : breaking the code /
Showell, Jak P. Mallmann.
Shepperton : Ian Allan,
2000.
Includes bibliographical references and index.
World War, 1939-1945
World War, 1939-1945
World War, 1939-1945
World War, 1939-1945
World War, 1914-1918
World War, 1939-1945
Submarines (Ships)