Columbia subject headings:
Bulgaria--History--Uprising, 1923 (September)
Bŭlgarska komunisticheska partii︠a︡--History.
Communism--Bulgaria--History.
Harvard subject headings:
Bulgaria--History--Uprising, 1923 (September)
Bŭlgarska komunisticheska partii︠a︡--History.
Communism--Bulgaria--History
Princeton subject headings: