About: http://webisa.webdatacommons.org/438496472

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	Includes topics such as Lewis and Clark's Expedition, Burr's Conspiracy and arrest, Barbary pirates, Abolition of slavery, War of 1812, Speeches and messages of presidents, etc This is a subscription based service.
http://www.w3.org/ns/prov#wasQuotedFrom	bl.uk