About: http://webisa.webdatacommons.org/224062191

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	The Romans used their engineering technology to extract large amounts of gold, copper and lead, as well as modest amounts of some other metals such as zinc and silver.
http://www.w3.org/ns/prov#wasQuotedFrom	schools-wikipedia.org