Columbia subject headings:
Harvard subject headings:
Airlift, Military--Germany--Berlin--History--Congresses.
Berlin (Germany)--History--1945-1990--Congresses.
Berlin (Germany)--History--Blockade, 1948-1949--Congresses.
Berlin (Germany)--Politics and government--1945-1990--Congresses.
Cold War--Congresses
Princeton subject headings:
Berlin (Germany)--History--Blockade, 1948-1949.
Cold War.