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Naval Vessel Registrar
http://www.nvr.navy.mil/nvrships/details/SSN648.htm
Aspro (SSN-648) fact sheet.
NavSource Online
http://www.navsource.org/archives/08/08648.htm
Aspro (SSN-648) facts and images.
NavyHistory.com
http://www.multied.com/Navy/Submarine/Aspro2.html
USS Aspro SSN-648 history.
Subnet
http://www.subnet.com/fleet/ssn648.htm
Photos, and brief ship's history.