Title: Glavnai︠a︡ astronomicheskai︠a︡ observatorii︠a︡ v Pulkove, 1839-1917
Subjects: Astronomical observatories, Sources, Glavnai︠a︡ astronomicheskai︠a︡ observatorii︠a︡ (Pulkovo, Russia), History
Places: Russia (Federation)