Title: Velikai︠a︡ Okti︠a︡brʹskai︠a︡ sot︠s︡ialisticheskai︠a︡ revoli︠u︡t︠s︡ii︠a︡ i revoli︠u︡t︠s︡ionnoe dvizhenie v Bolgarii
Subjects: Sources, Influence, Bŭlgarska komunisticheska partii︠a︡, History