Columbia subject headings:
Airlift, Military--Germany--Berlin--History--Congresses.
Berlin (Germany)--History--Blockade, 1948-1949--Congresses.
Harvard subject headings:
Airlift, Military--Germany--Berlin--History--20th century--Congresses.
Berlin (Germany)--History--1945-1990--Congresses.
Berlin (Germany)--History--Blockade, 1948-1949--Congresses.
Princeton subject headings:
Airlift, Military--Germany--Berlin--History--Congresses.
Berlin (Germany)--History--Blockade, 1948-1949--Congresses.