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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.
12-Sep-03 | GP-B delay
Gravity Probe B has been delayed once again, this time for the same reason that last postponed SIRTF: “delaminations within the layers of material that comprise the solid rocket booster nozzle exit-cone liners.” Three of the ATK Thiokol-built GEM 40 booster motors will be replaced as a precautionary measure. Nevertheless, stacking of the two-stage Delta 7920 at Space Launch Complex 2-West remains slated to begin next Monday, 15 September, with stacking of the second stage now set to precede attachment of the GEM 40 motors. (NASA ELV Status Report, 10-Sep-03)