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WikiPedia: USS Croaker (SS-246) http://www.williammaloney.com/Aviation/USSCroaker/... http://focus.nps.gov/AssetDetail/NRIS/08000863 http://www.nps.gov/history/nr/listings/20080919.HT... http://www.ibiblio.org/hyperwar/Japan/IJN/JANAC-Lo... http://www.navsource.org/archives/08/08246.htm //tools.wmflabs.org/geohack/geohack.php?language=v... https://www.history.navy.mil/research/histories/sh... https://uboat.net/allies/warships/ship/2992.html https://web.archive.org/web/20120616190738/http://...