Corona Satellite / Discoverer Program
History of Satellite Reconnaissance
Miscellaneous Records on Spy Satellites
National Reconnaissance Office (NRO) Directives
One of the Navy’s most advanced deep sea submersible at the time, surfaced with part of a U.S. spy satellite, codenamed HEXAGON.
The Jeremiah Panel - An NRO Review
The NRO - Its Mission, History, and People
The RECON - National Reconnaissance Office (NRO) Publication