About: http://webisa.webdatacommons.org/42570961

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	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://www.w3.org/ns/prov#wasQuotedFrom	google.com.au