"Guerre mondiale 1939-1945. Guerre navale. Mémoires." . . "2. Verdenskrig 1939-1945" . . "Konvoj" . . "Guerre mondiale 1939-1945. Commandement anglais. Walker." . . . . "Guerre mondiale 1939-1945. Unités. Marine anglaise. 36th Escort group." . . . "Walker's Groups in the Western Approaches, etc. [An account of the work of Western Approaches Groups of anti-submarine vessels under the command of Captain Frederick J. Walker, 1941-44. With plates, including a portrait.]"@en . . . . . . . . . . "Walker's Groups in the Western Approaches"@en . "Walker's Groups in the Western Approaches" . . . . . . . . "Walker's groups in the western approaches" . . . . "Walker's groups in the western approaches"@en . . . . . . "Walker's groups in the Western approaches" . . . . "Ubåd" . .