Columbia subject headings:
Harvard subject headings:
Aeronautics--Germany--Biography.
Inventors--Germany--Biography.
Lilienthal, Gustav, 1849-1933.
Lilienthal, Otto, 1848-1896.
Princeton subject headings:
Aeronautics--Germany--Biography.
Inventors--Germany--Biography.
Lilienthal, Gustav, 1849-1933.
Lilienthal, Otto, 1848-1896.