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http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	books and other documents, and softcopy electronic books, web sites, and database access.
http://www.w3.org/ns/prov#wasQuotedFrom	physicsforums.com