<http://webisa.webdatacommons.org/prov/469112338>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/376763371> .
<http://webisa.webdatacommons.org/376763371>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/376763371>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .
<http://webisa.webdatacommons.org/376763371>	<http://www.w3.org/ns/prov#value>	"Preferably there are means which seal off the circulating mud and other fluids to prevent environmental contamination whilst they are still circulating." .