Columbia subject headings:
Bulgaria--History--1941-1944.
Jews--Bulgaria--History.
World War, 1939-1945--Jews--Rescue--Bulgaria.
Harvard subject headings:
Bulgaria--History--1941-1944.
Holocaust, Jewish (1939-1945)--Bulgaria.
Jews--Bulgaria--History.
World War, 1939-1945--Jews--Rescue--Bulgaria.
Princeton subject headings: