Columbia subject headings:
Bulgaria--Foreign relations--United States.
Ukraine--History--Famine, 1932-1933.
United States--Foreign relations--Bulgaria.
Harvard subject headings:
Bulgaria--Foreign relations--United States.
Ukraine--History--Famine, 1932-1933
United States--Foreign relations--Bulgaria.
Princeton subject headings:
Bulgaria--Foreign relations--United States.
Ukraine--History--Famine, 1932-1933.
United States--Foreign relations--Bulgaria.