Columbia subject headings:
Harvard subject headings:
Aircraft industry--Austria--History--20th century.
Airplanes, Military--Austria--History--20th century.
Airplanes--Austria--Design and construction.
Airplanes--Austria--History--20th century.
Princeton subject headings:
Aircraft industry--Austria.
Airplanes--Austria.
Avis Flugzeug- und Autowerke.