Title: Sto let Pulkovskoĭ observatorii
Subjects: Pulkovo. Astronomicheskai︠a︡ observatorii︠a︡, Glavnai︠a︡ rossiĭskai︠a︡ astronomicheskai︠a︡ observatorii︠a︡, Glavnai︠a︡ astronomicheskai︠a︡ observatorii︠a︡ (Soviet Union)