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NAFTS
http://www.nafts.net/ortolan.htm
Images of USS Ortolan.
Naval Vessel Registrar
http://www.nvr.navy.mil/nvrships/details/ASR22.htm
Brief fact sheet for USS Ortolan (ASR-22).
NavSource Online
http://www.navsource.org/archives/09/3222.htm
ASR-22 Ortolan history, specifications, and images.