<http://webisa.webdatacommons.org/235644866>	<http://www.w3.org/ns/prov#value>	"Anything other than metals was after the 20th century." .
<http://webisa.webdatacommons.org/prov/294319970>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/235644866> .
<http://webisa.webdatacommons.org/235644866>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/235644866>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<collectorsweekly.com> .