@prefix bf: <http://id.loc.gov/ontologies/bibframe/> .
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@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

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    bflc:aap "Mates, Julian, 1927-2010. The American musical stage before 1800" ;
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    bf:subject [ a bf:Topic,
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            rdfs:label "Opera--United States" ;
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            bf:mainTitle "The American musical stage before 1800" ] .