About: http://webisa.webdatacommons.org/410250259

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	And the demand for the final products, e.g. newspapers, in which both types of raw materials are used, changes over time.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com