Columbia subject headings:
Wagner, Richard, 1813-1883--Criticism and interpretation--Congresses.
Harvard subject headings:
Wagner, Richard, 1813-1883--Criticism and interpretation--Congresses.
Wagner, Richard, 1813-1883--Dramatic production--Congresses.
Wagner, Richard, 1813-1883--Stage history--Congresses.
Princeton subject headings:
Wagner, Richard, 1813-1883--Criticism and interpretation--Congresses.