Columbia subject headings:
Harvard subject headings:
Operas--Librettos
Schreber, Daniel Paul, 1842-1911--Drama.
Princeton subject headings:
Drama.
Librettos.
Operas--Librettos.
Schreber, Daniel Gottlieb Moritz, 1808-1861--Drama.
Schreber, Daniel Paul, 1842-1911--Drama.