About: http://webisa.webdatacommons.org/276759875

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	The dates have been obtained in most cases from the autographs, and occasionally from letters or other sources.
http://www.w3.org/ns/prov#wasQuotedFrom	wikisource.org