Columbia subject headings:
Harvard subject headings:
Bulgaria--History--1944-
Bulgaria--History--1944-1990.
Communists--Bulgaria--Biography
Statesmen--Bulgaria--Biography.
Zhivkov, Todor.
Princeton subject headings:
Bulgaria--History--1944-
Communists--Bulgaria--Biography.
Statesmen--Bulgaria--Biography.
Zhivkov, Todor.