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N.Y History Symposium of the International Academy of Astronautics 1968 : New History Symposium of the International Academy of Astronautics 1968 : New York
- "History Symposium of the International Academy of Astronautics 1968 : New"
- "History Symposium of the International Academy of Astronautics 1968 : New York"
- "N.Y History Symposium of the International Academy of Astronautics 1968 : New History Symposium of the International Academy of Astronautics 1968 : New York"