"Visual Reconnaissance in I Corps"(PDF). Project CHECO, Headquarters Pacific Air Force. 30 September 1968. p. 7. Archived(PDF) from the original on July 28, 2018. Retrieved 24 September 2018.
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"Visual Reconnaissance in I Corps"(PDF). Project CHECO, Headquarters Pacific Air Force. 30 September 1968. p. 7. Archived(PDF) from the original on July 28, 2018. Retrieved 24 September 2018.