| Entry Text: | WILLIAMS, Kathleen Broome. Secret Weapon: US High Frequency Direction Finding in the Battle of the Atlantic. xix, 292p., bibliog., illus., index. Annapolis: NIP, 1996. ISBN: 1557509352.
A solid piece of research describing the development of HF/DF by the USN and emphasising its importance in the defeat of the U-boat. |
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