Columbia subject headings:
Harvard subject headings:
Aerodynamics--Research--Germany--History--20th century.
Aeronautics--Germany--History--20th century.
Airplanes--Germany--Design--History.
Institut für Entwurfsaerodynamik--History--20th century.
Princeton subject headings:
Aerodynamics--Research--Germany--History--20th century.
Aeronautics--Germany--History--20th century.
Airplanes--Germany--Design--History.
Institut für Entwurfsaerodynamik--History--20th century.