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Naval Vessel Registrar
http://www.nvr.navy.mil/nvrships/details/SSN725.htm
USS Helena specifications and historical facts.
NavSource Online
http://www.navsource.org/archives/08/08725.htm
Specifications, history, and images of USS Helena (SSN-725).
USS Helena (SSN-725)
http://www.skotfred.com/helena.html
Un-official website of USS Helena with crew roster, photos, and history of all US Navy ships named Helena.