Columbia subject headings:
Harvard subject headings:
Comic, The, in literature
Comic, The, in music.
Opera--Dramaturgy--History.
Operetta--France--History and criticism.
Operetta--Germany--History and criticism.
Poetics--History
Princeton subject headings:
Comic, The, in literature.
Comic, The, in music.
Opera--Dramaturgy--History.
Operetta--France--History and criticism.
Operetta--Germany--History and criticism.
Poetics--History.