Naval Historical Center - USS Helena history and photos. - http://www.history.navy.mil/photos/sh-usn/usnsh-h/cl50.htm
HyperWar - Description, history, and photograph of Light Cruiser USS Helena (CL-50) in WWII. After Action Report from Pearl Harbor. - http://www.ibiblio.org/hyperwar/USN/ships/CL/CL-50_Helena.html