About: http://webisa.webdatacommons.org/66709353

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	I didn't find out about that letter except by mistake late in my Bell Laboratories career, but it was an interesting subject.
http://www.w3.org/ns/prov#wasQuotedFrom	ethw.org