About: http://webisa.webdatacommons.org/178369315

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	Charts such as Copyright Term and the Public Domain in the United States (copyright.cornell.edu/resources/docs/copyrightterm.pdf) are also helpful.
http://www.w3.org/ns/prov#wasQuotedFrom	infotoday.com