Opera
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- Focus of12
- Opera -- 19th century
- Opera -- France
- Opera -- Vocal scores with piano
- Opera -- England -- 19th century
- Opera -- Italy -- 20th century -- Selections
- Opera -- Italy -- 18th century -- Fiction
- Opera -- New York (State) -- New York -- Drama
- Opera -- 20th century
- Opera -- Excerpts
- Opera -- Germany
- Opera -- Great Britain -- Biography
- Opera -- Germany -- 20th century
- Opera -- Europe -- 18th century
- Opera -- Caricatures and cartoons
- Opera -- Reviews
- Opera -- Excerpts, Arranged
- Opera -- France -- History and criticism
- Opera -- Italy -- 19th century
- Opera -- Anecdotes
- Opera -- Teen fiction
- Opera -- Comic books, strips, etc
- Opera -- Australia
- Opera
- Opera -- Ontario -- London
- Opera -- Juvenile fiction
- Opera -- Europe -- Drama
- Opera -- British Columbia -- Vancouver
- Opera -- France -- Paris -- Fiction
- Opera -- Comic books, strips, etc -- Juvenile fiction
- Opera -- British Columbia -- Victoria
- Opera -- Drama
- Opera -- Excerpts -- Juvenile sound recordings
- Opera -- Periodicals
- Opera -- Fiction
- Sub focus of6
- Opera + Social aspects -- Czech Republic -- Prague -- 20th century
- Opera + Social aspects -- Germany -- Dresden -- 20th century
- Opera + History
- Opera + Social aspects -- Ukraine -- Lʹviv -- 20th century
- Opera + Social aspects
- Opera + Social aspects -- Czech Republic -- Prague -- 19th century
- Opera + Social aspects -- Germany -- Dresden -- 19th century
- Opera + Classical influences
- Opera + Religious aspects
- Opera + Production and direction
- Opera + Political aspects -- Austria -- History -- 20th century
- Music + Opera
- Opera + Social aspects -- Ukraine -- Lʹviv -- 19th century
- Opera + Political aspects + History
- Opera + English
- Opera + Fiction
- Opera + Political aspects + History -- 19th century
- Opera + Societies, etc
- Opera + Political aspects + History -- 20th century
- Opera + Dramaturgy