Columbia subject headings:
Aeronautics, Commercial--Germany--Bavaria--History--20th century.
Bavaria (Germany)--History--20th century.
Harvard subject headings:
Aeronautics, Commercial--Germany--Bavaria--History--20th century.
Bavaria (Germany)--History--20th century.
Princeton subject headings:
Aeronautics, Commercial--Germany--Bavaria--History--20th century.
Bavaria (Germany)--History--20th century.