<http://webisa.webdatacommons.org/prov/16979980>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/400842391> .
<http://webisa.webdatacommons.org/400842391>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/400842391>	<http://www.w3.org/ns/prov#value>	"metals including steel and beryllium, which is even harder. (Division Heads, 1932, p." .
<http://webisa.webdatacommons.org/prov/374102222>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/400842391> .
<http://webisa.webdatacommons.org/400842391>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<spmc.org> .