Columbia subject headings:
Harvard subject headings:
Aeronautical engineers--Germany--Biography
Gliding and soaring--Germany--History.
Lilienthal, Otto, 1848-1896.
Princeton subject headings:
Aeronautics--Germany--Biography.
Aeronautics--Germany--Exhibitions.
Gliding and soaring--History--Exhibitions.
Lilienthal, Otto, 1848-1896--Exhibitions.
Lilienthal, Otto, 1848-1896.