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<http://worldcat.org/entity/work/id/30717254> <http://schema.org/about> <http://id.loc.gov/authorities/subjects/sh85063493> .
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<http://worldcat.org/entity/work/id/30717254> <http://schema.org/workExample> <http://www.worldcat.org/oclc/690681483> .
<http://worldcat.org/entity/work/id/30717254> <http://schema.org/workExample> <http://www.worldcat.org/oclc/753324844> .
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<http://worldcat.org/entity/work/id/30717254> <http://schema.org/alternateName> "Description and use of a proportional camera obscura"@en .
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<http://worldcat.org/entity/work/id/30717254> <http://schema.org/workExample> <http://www.worldcat.org/oclc/225032942> .
<http://worldcat.org/entity/work/id/30717254> <http://schema.org/about> <http://id.worldcat.org/fast/965280> .
<http://worldcat.org/entity/work/id/30717254> <http://schema.org/workExample> <http://www.worldcat.org/oclc/643762270> .
<http://worldcat.org/entity/work/id/30717254> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://schema.org/Book> .
<http://experiment.worldcat.org/entity/work/data/30717254.nt> <http://rdfs.org/ns/void#inDataset> <http://purl.oclc.org/dataset/WorldCat/Works> .
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