Operas
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- Narrower13
- Focus of30
- Operas -- Fiction
- Operas -- United States -- 20th century -- Excerpts
- Operas -- Television adaptations
- Operas -- Vocal scores without accompaniment
- Operas -- 21st century
- Operas -- Stories, plots, etc
- Operas -- Discography
- Operas -- Juvenile sound recordings
- Operas -- Comic books, strips, etc
- Operas -- Drama
- Operas -- Instrumental settings
- Operas -- Librettos -- Juvenile fiction
- Operas -- To 1800 -- Librettos
- Operas -- Stories, plots, etc -- Juvenile literature
- Operas -- Vocal scores with piano
- Operas -- Excerpts -- Vocal scores with organ
- Operas -- Juvenile
- Operas -- Excerpts, Arranged -- Scores
- Operas -- Film adaptations
- Operas -- Excerpts -- Vocal scores with piano
- Operas -- 19th century -- History and criticism
- Operas -- Librettos
- Operas -- Excerpts -- Scores
- Operas -- Compact disc catalogs
- Operas -- Scores
- Operas -- Bibliography
- Sub focus of14
- Operas + Performances -- 20th century
- Operas + Excerpts + Vocal scores with piano
- Operas + Excerpts + Vocal scores
- Operas + Stories, plots, etc
- Operas + Piano scores
- Operas + Scores
- Operas + Excerpts + Scores
- Operas + Excerpts + Piano scores
- Operas + Analysis, appreciation
- Operas + Excerpts -- Vocal scores with piano
- Operas + Vocal scores with piano