Columbia subject headings:
Bulgaria--Politics and government--1944-
Bŭlgarski zemedelski naroden sŭi︠u︡z--History.
Harvard subject headings:
Bulgaria--Politics and government--1944-
Bulgaria--Politics and government--1944-1990.
Bŭlgarski zemedelski naroden sŭi︠u︡z--History.
Princeton subject headings: