| Operas -- Stories, plots, etc. Matches 7 items |
| Operas -- Stories, plots, etc -- Dictionaries. Matches 1 item |
| Operas -- Television adaptations -- History and criticism. Matches 1 item |
| Operas -- To 1800 -- Librettos. Matches 1 item |
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Operas -- Vocal scores with piano -- Excerpts. SEE: Operas -- Excerpts -- Vocal scores with piano Matches 2 items
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Operatic characters. SEE: Characters and characteristics in opera Matches 1 item
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Operatic characters -- Dictionaries. SEE: Operas -- Characters -- Dictionaries. Matches 2 items
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Operating life (Engineering) SEE: Service life (Engineering) Matches 1 item
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Operating statements. SEE: Financial statements Matches 6 items
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Operating statements -- United States. SEE: Financial statements -- United States Matches 5 items
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