Title: Vtorai︠a︡ i tret'i︠a︡ Petrogradskie obshchegorodskie konferent︠s︡ii bol'shevikov v ii︠u︡le i okti︠a︡bre 1917 goda
Subjects: Communism, Congresses, Rossiĭskai︠a︡ sot︠s︡ial-demokraticheskai︠a︡ rabochai︠a︡ partii︠a︡
Places: Soviet Union