<http://webisa.webdatacommons.org/3220756>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<nationalgeographic.com> .
<http://webisa.webdatacommons.org/prov/132594838>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/3220756> .
<http://webisa.webdatacommons.org/prov/163004892>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/3220756> .
<http://webisa.webdatacommons.org/3220756>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/3220756>	<http://www.w3.org/ns/prov#value>	"Surface waters such as lakes, reservoirs, and rivers are the most visible sources and are often tapped for public water supply." .