About: http://webisa.webdatacommons.org/444901212

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	Some PAHs such as naphthalene are also obtained from the concentration of the high boiling residual oil (and asphalt) derived from crude petroleum refinery processing.
http://www.w3.org/ns/prov#wasQuotedFrom	chemicalland21.com