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Haze Gray and Underway
http://www.hazegray.org/danfs/submar/ssn663.htm
SSN-663 brief history from the Dictionary of American Naval Fighting Ships.
Naval Vessel Registrar
http://www.nvr.navy.mil/nvrships/details/SSN663.htm
SSN-663 fact sheet.
USS Hammerhead (SS-364/SSN-663)
http://www.skyenet.net/~dwiseman/
Crew registries and rosters, history of both boats, photos, and memorials.