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<http://webisa.webdatacommons.org/prov/331100077>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/389689232> .
<http://webisa.webdatacommons.org/389689232>	<http://www.w3.org/ns/prov#value>	"Major energy resources such as oil, gas and coal are nonrenewable, and their cost of extraction must increase with cumulative depletion." .
<http://webisa.webdatacommons.org/389689232>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<docstoc.com> .