Matches in DBpedia 2016-04 for { ?s ?p <http://books.google.com/books?id=piwP9HXtpvUC&pg=PA34&lpg=PA34&dq=%22porro+prism%22+binoculars+produce+brighter+image+than+%22roof+prism%22#PPA34,M1> }
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