"Minekrig" . . "Skibstab" . . "Ubådsjagt" . . "Submarine warfare." . . "Submarine warfare" . "Geschichte." . . "Unterseeboot." . . "Military operations, Naval Submarine." . . "Military operations, Naval Submarine" . "Guerre mondiale, 1914-1918, operations Front occidental, perte." . . "Antiubådskrig" . . "Grossbritannien." . . "1. Verdenskrig 1914-1918" . . "World War, 1914-1918 Naval operations Submarine." . . "Ubåd" . . "Nordsøen" . . "Guerra mondiale 1914-1918 Operazioni navali." . . "Middelhavet" . . . . "Guerre mondiale, 1914-1918, unités allemande, sous-marins." . . "Engelske Kanal" . . . . . . . . . . "U-boats destroyed : the effect of anti-submarine warfare, 1914-1918" . . . . . . . . . . "U-boats destroyed : The effect of anti-submarine warfare 1914-1918" . . . . . . . . . . . . . . . . "U-Boats destroyed. The effect of anti-submarine warfare, 1914-1918. [With plates and maps.]" . "U-Boats destroyed. The effect of anti-submarine warfare, 1914-1918. [With plates and maps.]"@en . . . . . . . . "U-boats destroyed : the effect of anti-submarine warfare 1914-1918" . . . . . . . "U-boats destroyed; the effect of anti-submarine warfare, 1914-1918" . "U-boats destroyed: the effect of anti-submarine warfare 1914-1918. [With plates, and a bibliography.]"@en . . "U-boats destroyed the effect of anti-submarine warfare, 1914-1918"@en . "World War (1914-1918)" . . . "1914 - 1918" . . "1914-1918" . "Seekrieg." . . "Guerre mondiale, 1914-1918, guerre sous-marine." . .