Columbia subject headings:
Bulgaria--Economic policy--1944-1989.
Bulgaria--Politics and government--1944-1990.
Bulgaria--Social policy.
Harvard subject headings:
Bulgaria--Economic policy--1944-
Bulgaria--Economic policy--1944-1989.
Bulgaria--Politics and government--1944-
Bulgaria--Politics and government--1944-1990.
Bulgaria--Social policy.
Princeton subject headings:
Bulgaria--Economic policy--1944-1989.
Bulgaria--Politics and government--1944-
Bulgaria--Social policy.