Columbia subject headings:
Operas--Librettos.
Wagner, Richard, 1813-1883. Tannhäuser.
Harvard subject headings:
Operas--Librettos
Tannhäuser--Drama.
Wagner, Richard, 1813-1883. Tannhäuser.
Princeton subject headings:
Librettos.
Operas--Librettos.
Wagner, Richard, 1813-1883. Tannhäuser.