<http://webisa.webdatacommons.org/197763997>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/14057124>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/197763997> .
<http://webisa.webdatacommons.org/197763997>	<http://www.w3.org/ns/prov#value>	"Discusses the problem of maintaining a clean water supply and relates this issue to such topics as pollution, depletion of sources and other environmental concerns." .
<http://webisa.webdatacommons.org/197763997>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<yale.edu> .