About: http://webisa.webdatacommons.org/259178790

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	We have written to you before and sent you some material we have published because your work has been quoted in them, and certain discussions on PBS and other programs.
http://www.w3.org/ns/prov#wasQuotedFrom	pbs.org