Columbia subject headings:
Harvard subject headings:
Aeronautics--Germany--Kassel--Biography.
Aircraft industry--Germany--Kassel--History--20th century.
Aircraft industry--Germany--Kassel--History--21st century.
Aircraft industry--Technological innovations--Germany--Kassel--History--20th century.
Aircraft industry--Technological innovations--Germany--Kassel--History--21st century.
Princeton subject headings:
Aeronautics--Germany--Kassel--Biography.
Aircraft industry--Germany--Kassel--History--20th century.
Aircraft industry--Germany--Kassel--History--21st century.
Aircraft industry--Technological innovations--Germany--Kassel--History--20th century.
Aircraft industry--Technological innovations--Germany--Kassel--History--21st century.