@prefix bf: <http://id.loc.gov/ontologies/bibframe/> .
@prefix bflc: <http://id.loc.gov/ontologies/bflc/> .
@prefix mads: <http://www.loc.gov/mads/rdf/v1#> .
@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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        bf:Work ;
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            bf:role <http://id.loc.gov/vocabulary/relators/aut> ] ;
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    bf:subject [ a bf:Topic,
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    bf:title [ a bf:VariantTitle,
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            bf:mainTitle "Water engineer" ],
        [ a bf:Title ;
            bf:mainTitle "Memoirs of a water engineer" ] .