About: http://webisa.webdatacommons.org/46674580

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	It is well known that crude oil as well as products from extraction and/or liquefaction of coal and lignite, products from tar sands, products from shale oil and similar products may contain metals such as vanadium, nickel, and iron.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com