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pulkovo (r.s.f.s.r.). astronomischeskaia observatoriia

The Main Astronomical Observatory of the Academy of Sciences of the USSR at Pulkovo / Yu. I. Vitinsky

By I︠U︡. I. Vitinskiĭ,Glavnai︠a︡ astronomicheskai︠a︡ observatorii︠a︡ (Soviet Union),Akademii︠a︡ nauk SSSR,Pulkovo Glavnaia astronomicheskaia observatoriia