Columbia subject headings:
Voss, Egon.
Wagner, Richard, 1813-1883--Congresses.
Harvard subject headings:
Composers--Germany--19th century--Congresses.
Voss, Egon
Wagner, Richard, 1813-1883--Congresses.
Wagner, Richard, 1813-1883--Criticism and interpretation.
Princeton subject headings:
Voss, Egon.
Wagner, Richard, 1813-1883--Criticism and interpretation.