Columbia subject headings:
Harvard subject headings:
Aeronautics, Military--Germany (East)--History.
Airlines--Germany--Berlin--History--20th century.
Airports--Germany--Berlin--History--20th century.
Airports--Technological innovations--Germany--Berlin--History--20th century.
Flughafen Berlin-Schönefeld--History--20th century.
Interflug (Airline)--History--20th century.
Transport planes--Germany--Berlin--History--20th century.
Princeton subject headings:
Aeronautics, Military--Germany (East)--History.
Airlines--Germany--Berlin--History--20th century.
Airports--Germany--Berlin--History--20th century.
Airports--Technological innovations--Germany--Berlin--History--20th century.
Flughafen Berlin-Schönefeld--History--20th century.
Interflug (Airline)--History--20th century.
Transport planes--Germany--Berlin--History--20th century.