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"The Navy's Spy Missions in Space". U.S. Naval Research Laboratory. April 2008. Archived from the original on 21 April 2019. Retrieved 21 April 2019. This article incorporates text from this source, which is in the public domain.
This article incorporates text from this source, which is in the public domain: United States; Central Intelligence Agency; Ruffner, Kevin Conley (1995). CORONA America's first satellite program. Center for the Study of Intelligence, Central Intelligence Agency. p. xiii. OCLC42006243.