Rossiĭskai︠a︡ sot︠s︡ial-demokraticheskai︠a︡ rabochai︠a︡ partii︠a︡. Petrogradskai︠a︡ obshchegorodskai︠a︡ konferent︠s︡ii︠a︡ — Author | Lex | Lex