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References
- ↑ Jonathan's space update No. 369 Archived 2009-06-19 at the Wayback Machine (1998-08-22) Lists U.S. SIGINT launches
- ↑ Jonathan's space report No. 501 Archived 2007-09-27 at the Wayback Machine (2003-06-06) Speculation on the CANYON launches
- ↑ "CANYON – SIGINT Spacecraft Series – ( NRO/USAF/NSA Program AFP-827)". 2007-06-28. Retrieved 2013-06-11.
- ↑ Richelson, Jeffrey T. ed. U.S. Military Uses of Space, 1945-1991 Vol 1, Guide. National Security Archive. 1991.
- ↑ "Archived copy". Archived from the original on 2009-12-01. Retrieved 2009-09-19.
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