Columbia subject headings:
Harvard subject headings:
Drama festivals--Germany--Mannheim--History--21st century.
Freilichtbühne Mannheim--History.
Theater, Open-air--Germany--Mannheim--History--20th century.
Theater, Open-air--Germany--Mannheim--History--21st century.
Princeton subject headings:
Drama festivals--Germany--Mannheim--History--21st century.
Freilichtbühne Mannheim--History.
Theater, Open-air--Germany--Mannheim--History--20th century.
Theater, Open-air--Germany--Mannheim--History--21st century.