About: http://webisa.webdatacommons.org/213899622

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	Next to the item is a drop down list that says certain by default, but which can be changed to either probable (=reasonably sure but not completely) or estimated (=a rough but informed guess).
http://www.w3.org/ns/prov#wasQuotedFrom	thlib.org