About: http://webisa.webdatacommons.org/181830007

Property	Value
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	OK, since you have got what sounds like mostly disjoint data (and do not care if you get some duplicates anyway) there is a workaround that I have used in Postgres which may be applicable:
http://www.w3.org/ns/prov#wasQuotedFrom	serverfault.com