Columbia subject headings:
Ballets--Librettos--Bibliography--Catalogs.
Biblioteca palatina di Caserta--Catalogs.
Operas--19th century--Librettos--Bibliography--Catalogs.
Harvard subject headings:
Ballets--19th century--Librettos--Bibliography--Catalogs.
Biblioteca palatina di Caserta--Catalogs.
Librettos--Bibliography--Catalogs.
Operas--19th century--Librettos--Bibliography--Catalogs.
Operas--Librettos--Bibliography--Catalogs.
Princeton subject headings:
Ballets--19th century--Librettos--Bibliography--Catalogs.
Biblioteca palatina di Caserta--Catalogs.
Operas--19th century--Librettos--Bibliography--Catalogs.