PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • The reserves span the continent, from Barnett shale in Texas to Marcellus shale in Eastern and Mid-Atlantic states ??? to large deposits in western Canada, Colorado, North Dakota, Montana and other states (and around the world).Instead of importing gas, the United States could become an exporter.
http://www.w3.org/ns/prov#wasQuotedFrom
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