Düben collection
... that the Düben collection contains the sole surviving copies of many works by Dieterich Buxtehude?
... that the <b id="mwBNc"><a href="./Düben_collection" id="mwBNg" rel="mw:WikiLink" title="Düben collection">Düben collection</a></b> contains the sole surviving copies of many works by <a href="./Dieterich_Buxtehude" id="mwBNk" rel="mw:WikiLink" title="Dieterich Buxtehude">Dieterich Buxtehude</a>?