About: http://webisa.webdatacommons.org/297790878

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	The possibility of employing lighter metals such as aluminum, lithium and sodium has been examined, but the difficulty of recovering the spent shale from the bottom of the metal bath presents a problem.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com