XIIth International Astronautical Congress, Washington, D.C., 1961. XII. Internationaler Astronautischer Kongress. XIIe Congrès International D'Astronautique. (Under the Auspices of the American Rocket Society.) Proceedings

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XIIth International Astronautical Congress, Washington, D.C., 1961. XII Internationaler Astronautischer Kongress. XIIe Congrès International D'Astronautique. Proceedings. Editors-in-chief, Robert M.L. Baker, Jr., and Maud W. Makemson

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XIth International Astronautical Congress Stockholm 1960 / XI. Internationaler Astronautischer Kongress / XIe Congrès International D’Astronautique

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International Astronautical Congress, 11th.- Internationaler Astronautischer Kongress, 11.- Congrès International D'astronautique, 11me, Stockholm, 1961

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VIIIth International Astronautical Congress Barcelona 1957 / VIII. Internationaler Astronautischer Kongress / VIIIe Congrès International D’Astronautique

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Xth International Astronautical Congress London 1959 / X. Internationaler Astronautischer Kongress / Xe Congrès International d’Astronautique

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XII. Internationaler Astronautischer Kongress

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International Astronautical Congress, 11th.- Internationaler Astronautischer Kongress. 11.- Congrès International D'astronautique, 11me, Stockholm 1960

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XIth International Astronautical Congress Stockholm 1960

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International Astronautical Congress, 11th.- Internationaler Astronautischer Kongress, 11.- Congrès International D'astronautique, 11me, Stockholm, 1960

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