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Proposed Spacecraft operation procedures change for Entry Monitor System (EMS); originally dated June 20, 1968, altered January 21, 1969.
NASA - National Aeronautics and Space Administration, Apollo moon mission space race, Space flight, SM2A-03-SC104-(2)
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National Aeronatics and Space Administration (NASA), "Entry Monitor System (EMS) - Proposed spacecraft operational procedures changes - Malfunction Symptoms" (1969). Apollo One Investigation Materials. 9.