<http://webisa.webdatacommons.org/42570961>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com.au> .
<http://webisa.webdatacommons.org/42570961>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/42570961>	<http://www.w3.org/ns/prov#value>	"Silica sand and slag are chiefly used as abrasive materials; in the following, reference will be made mostly to the materials\", meaning either or both of them." .
<http://webisa.webdatacommons.org/prov/185455455>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/42570961> .