About: http://webisa.webdatacommons.org/258579161

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	Spain and particularly Portugal provided Germany with invaluable supplies of wolfram (tungsten) required in the steel-hardening process.
http://www.w3.org/ns/prov#wasQuotedFrom	pbs.org