Columbia subject headings:
Harvard subject headings:
Aircraft industry--Germany--History.
Airships--Germany--History.
Luftschiffbau Zeppelin.
Zeppelin, Ferdinand, Graf von, 1838-1917
Princeton subject headings:
Aircraft industry--Germany--History.
Airships--Germany--History.
Luftschiffbau Zeppelin.
Zeppelin, Ferdinand, Graf von, 1838-1917.