Columbia subject headings:
Bulgaria--Politics and government--1878-1944.
Bulgaria--Politics and government--1944-1990.
Political parties--Bulgaria--History.
Politicians--Bulgaria.
Harvard subject headings:
Associations, institutions, etc.--Bulgaria--History.
Bulgaria--Politics and government--1878-1944.
Bulgaria--Politics and government--1944-
Political parties--Bulgaria--History.
Statesmen--Bulgaria.
Princeton subject headings:
Bulgaria--Politics and government--1878-1944.
Bulgaria--Politics and government--1944-1990.
Political parties--Bulgaria--History.
Politicians--Bulgaria.