About: http://webisa.webdatacommons.org/441868148

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	it is not addressed to anybody in particular so I would not really term it a letter but sort of a satirical statement.
http://www.w3.org/ns/prov#wasQuotedFrom	pbs.org