Title: Velikata Oktombriĭska sot︠s︡ialisticheska revoli︠u︡t︠s︡ii︠a︡ i revoli︠u︡t︠s︡ionnite borbi v Bŭlgarii︠a︡ prez 1917-1919
Subjects: History, Sources, Bŭlgarska komunisticheska partii︠a︡
Places: Bulgaria
Time periods: 20th century