Columbia subject headings:
Iseult (Legendary character)--Drama.
Operas--Librettos.
Tristan (Legendary character)--Drama.
Wagner, Richard, 1813-1883. Tristan und Isolde.
Harvard subject headings:
Iseult (Legendary character)--Drama.
Operas--Librettos
Tristan (Legendary character)--Drama.
Wagner, Richard, 1813-1883. Tristan und Isolde.
Princeton subject headings:
Librettos.
Operas--Librettos.
Wagner, Richard, 1813-1883. Tristan und Isolde.