U-boat intelligence, 1914-1918 /
Grant, Robert M.(Robert McQueen),1917-2014.
Penzance : Periscope Pub,
2002.
Originally published: London : Putnam, 1969.
Includes bibliographical references and index.
World War, 1914-1918
Military intelligence
World War, 1914-1918
Submarines (Ships)