Matches in DBpedia 2014 for { ?s ?p <http://books.google.com/books?hl=en&lr=&id=RnWym5-bm8kC&oi=fnd&pg=PA32&dq=challenging+piagetian+stages+of+cognitive+development&ots=6weMo4KEk_&sig=_zYhvLeClpOXBp3wEH2MpGUeYkM#v=onepage&q&f=false> . }
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