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Submarines of the Imperial Japanese Navy - Wikipedia
Japanese submarines in the Pacific War - Wikipedia
I-400-class submarine - Wikipedia
WW2 Imperial Japanese Navy Submarines - Naval Encyclopedia
The Japanese Submarine Campaign of WW2 - Origins to Coral Sea
Japanese Submarines in World War Two | U.S. Naval Institute
Sensuikan Butai (潜水艦部隊): Researching Submarines of
The Midget Subs That Beat the Planes to Pearl Harbor
THE JAPANESE SUBMARINE FORCE AND WORLD WAR II
Japanese submarine I-19 was the scourge of the Pacific.