Columbia subject headings:
Harvard subject headings:
Berlin (Germany)--History--Blockade, 1948-1949
Soviet Union--Foreign relations--United States.
United States--Foreign relations--1945-1953.
United States--Foreign relations--Soviet Union.
Princeton subject headings:
Berlin (Germany)--History--Blockade, 1948-1949.
United States--Foreign relations--1945-1953.
United States--Politics and government--1945-1953.