Updated collection.rdf

Author: jcowey

RDF/collection.rdf

@@ -1640,4 +1640,7 @@
     <rdf:Description rdf:about="http://papyri.info/ddbdp/p.cair.preis.2ed">
         <dcterms:bibliographicCitation>P.Cair.Preis.2ed</dcterms:bibliographicCitation>
     </rdf:Description>
+    <rdf:Description rdf:about="http://papyri.info/ddbdp/p.petr.2ed">
+        <dcterms:bibliographicCitation>P.Petr.2ed</dcterms:bibliographicCitation>
+    </rdf:Description>
 </rdf:RDF>