About: http://webisa.webdatacommons.org/270224176

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	In political history, primary sources reflect documents such as official reports, speeches, pamphlets, posters, or letters by participants, official election returns, and eyewitness accounts.
http://www.w3.org/ns/prov#wasQuotedFrom	werelate.org