Columbia subject headings:
Opera--Production and direction.
Opera--Stage-setting and scenery.
Wagner, Richard, 1813-1883--Criticism and interpretation.
Harvard subject headings:
Opera--Production and direction
Opera--Stage-setting and scenery
Wagner, Richard, 1813-1883--Criticism and interpretation.
Princeton subject headings:
Opera--Production and direction.
Opera--Stage-setting and scenery.
Wagner, Richard, 1813-1883--Criticism and interpretation.