Columbia subject headings:
Harvard subject headings:
Aeronautical engineers--Germany--Biography
Aeronautics--Germany--History
Airships--Germany--History.
Luftschiffbau Zeppelin.
Zeppelin, Ferdinand, Graf von, 1838-1917
Princeton subject headings:
Aeronautical engineers--Germany--Biography.
Aeronautics--Germany--History.
Airships--Germany--History.
Zeppelin, Ferdinand, Graf von, 1838-1917.