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<http://webisa.webdatacommons.org/prov/368119281>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/234810188> .
<http://webisa.webdatacommons.org/234810188>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/234810188>	<http://www.w3.org/ns/prov#value>	"Production takes place mainly in Texas and North Dakota, with various states in the Rocky Mountains making a small but growing contribution." .
<http://webisa.webdatacommons.org/234810188>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<realclearworld.com> .