<http://webisa.webdatacommons.org/428258048>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<ox.ac.uk> .
<http://webisa.webdatacommons.org/428258048>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/24131518>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/428258048> .
<http://webisa.webdatacommons.org/428258048>	<http://www.w3.org/ns/prov#value>	"Clay is mixed with limestone and other minerals, including one called gypsum that is added to help the cement harden." .