Columbia subject headings:
Operas--Librettos.
Strauss, Richard, 1864-1949. Rosenkavalier (Opera)
Harvard subject headings:
Operas--Librettos
Strauss, Richard, 1864-1949. Rosenkavalier (Opera)
Strauss, Richard, 1864-1949. Rosenkavalier.
Princeton subject headings:
Librettos.
Operas--Librettos.
Strauss, Richard, 1864-1949. Rosenkavalier (Opera)