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title:"Research"
Geschichte Katharina II. / von B. von Bilbassoff ; Bd. 2, Abt. 2: Forschungen, Briefe und Dokumente
Geschichte Katharinas II. / von B. von Bilbassoff ; Bd. 1, Abt. 2: Forschungen, Briefe und Dokumente
SCIENTIFIC RESEARCH SPACE APPARATUS RETURNED FROM EARTH ORBIT
SPACECRAFT FOR RESEARCH PURPOSES IN THE PRESENCE OF SOLAR FLUX OF INCREASED DENSITY