Perhaps of analytical or historical interest. http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19620003290_1962003290.pdf THE ORBITAL BEHAVIOR OF THE ECHO I SATELLITE AND ITS ROCKET CASING DURING THE FIRST 500 DAYS By Gertrude C. Westrick and Katherine G. Johnson Langley Research Center Langley Station, Hampton, Va. NATIONAL AERONAUTICS AND SPACE ADMINISTRATION WASHINGTON June 1962 ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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