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History of the Aeronautical Systems Division, July-December 1963. volume III, Termination of the X-20A Dyna-Soar (narrative)
- "Termination of the X-20A Dyna-Soar (narrative)"@en
- "History of the Aeronautical Systems Division, July-December 1963. volume III, Termination of the X-20A Dyna-Soar (narrative)"@en