About: http://webisa.webdatacommons.org/131289264

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	In return, raw materials, such as amber and leather, and many slaves went back across the frontier.
http://www.w3.org/ns/prov#wasQuotedFrom	britannica.com