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Sources
kevinforsyth.net
To Reach the High Frontier: A History of U.S. Launch Vehicles
"A valuable contribution to the field of aerospace literature," this book includes an extensive overview of Delta history and development along with chapters on Atlas, Titan, Scout, Space Shuttle, and much more.
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Many other excellent books about spaceflight are recommended here.
13-May-05 | “Modernized” GPS delayed
The launch of the first NAVSTAR IIR-M for the Air Force’s Global Positioning System has been delayed indefinitely for unspecified reasons. In all, eight IIRs will be converted into IIR-Ms, which add a second signal for civilian use and two new encrypted signals for military use. The “M-Code†signals, scheduled to be fully operational by 2010, will have increased power and reduced vulnerability to signal jamming.