<http://webisa.webdatacommons.org/prov/232323170>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/311624662> .
<http://webisa.webdatacommons.org/prov/438657324>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/311624662> .
<http://webisa.webdatacommons.org/311624662>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<docstoc.com> .
<http://webisa.webdatacommons.org/311624662>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/311624662>	<http://www.w3.org/ns/prov#value>	"It may also contain other substances such as water, natural gas, sulphur and other minerals." .