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<http://webisa.webdatacommons.org/prov/316554311>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/204403772> .
<http://webisa.webdatacommons.org/prov/263641159>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/204403772> .
<http://webisa.webdatacommons.org/204403772>	<http://www.w3.org/ns/prov#value>	"The prices we obtain for our oil, gas, minerals and other commodities are determined by, or linked to, prices in world markets, which have historically been subject to substantial variations because of fluctuations in supply and demand." .
<http://webisa.webdatacommons.org/204403772>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<docstoc.com> .