About: http://webisa.webdatacommons.org/190119831

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	Metals contained in crude oils, residual fractions, and the like present difficulties in refining or upgrading to more valuable products, such as gasoline, turbine fuel, etc.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com