Title: Chetvertyĭ (obʺedinitelʹnyĭ) sʺezd RSDRP, aprelʹ-maĭ 1906 goda
Subjects: Congresses, Rossiĭskai︠a︡ sot︠s︡ial-demokraticheskai︠a︡ rabochai︠a︡ partii︠a︡, Kommunisticheskai︠a︡ partii︠a︡ Sovetskogo Soi︠u︡za