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WikiPedia: USS_Grouper_(SS-214) http://www.lisbonmaru.com http://hazegray.org/danfs/submar/ss214.txt http://www.ibiblio.org/hyperwar/Japan/IJN/JANAC-Lo... http://www.navsource.org/archives/08/08214.htm https://www.history.navy.mil/research/histories/sh... https://uboat.net/allies/warships/ship/2960.html