Columbia subject headings:
Bulgaria--Politics and government--1878-1944.
Bŭlgarska komunisticheska partii︠a︡--History.
Communism--Bulgaria--History.
Harvard subject headings:
Bulgaria--Politics and government--1878-1944.
Bŭlgarska komunisticheska partii︠a︡--History.
Communism--Bulgaria--History
Princeton subject headings: