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- International Astronautical Congress (12)
- Duboshin, G. N. (Georgiĭ Nikolaevich) (5)
- Hilton, W. F. (5)
- Łunc, Michał (5)
- Contensou, P. (4)
- International Conference on Nonlinear Oscillations (2)
- Kleczek, Josip (2)
- Akademie der Wissenschaften der DDR. Abteilung Mathematik, Naturwissenschaften, Technik (1)
- Brun, E. A. (1)
- Butzer, Paul Leo, 1928- (1)
- Bŭlgarska akademii︠a︡ na naukite (1)
- COSPAR (1)
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- Freiberger, Walter F. (1)
- International Astronomical Union (1)
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- Mirzoi︠a︡n, L. V. (1)
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- Schmidt, Günther, 1921- (1)
- Steinberg, Jean-Louis (1)
- Symposium on Meteorite Research(1968 : Vienna) (1)
- Szőkefalvi-Nagy, Béla, 1913- (1)
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- Weinert, Horst (1)
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