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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.
08-Jun-01 | NASA approves MESSENGER
Another NASA go-ahead for full-scale development has been announced, this time for MESSENGER, a $256 million mission that will be the first to orbit the planet Mercury. Mariner 10, the only other spacecraft to study Mercury, made three fly-bys in 1974-75. MESSENGER, which will spend one Earth year in orbit to compile a complete global map of the Sun’s closest neighbour, is scheduled to launch in March 2004 aboard a three-stage Delta II using the higher-powered GEM-46 booster motors of Delta III. (NASA Press Release, 07-Jun-01, refers to this as the seventh NASA Discovery mission, a distinction arguably held by Deep Impact.* Ultimately this discrepancy will be resolved by which program suffers fewer delays and launches first.)