Title: Materialy k nauchnoĭ sessii, posvi︠a︡shchennoĭ 50-letii︠u︡ Velikoĭ Okti︠a︡brʹskoĭ sot︠s︡ialisticheskoĭ revoli︠u︡t︠s︡ii
Subjects: History, Anniversaries, Congresses
Places: Soviet Union
Time periods: Revolution, 1917-1921