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Published April 30, 2013, 12:00 AM

ND flag waves from a drilling rig

A North Dakota state flag waves in the wind from the floor of a drilling rig operated by Whiting Petroleum Corp. last month southwest of Belfield, N.D. Dustin Monke / Forum News Service
Read the article: Although new USGS oil estimate for ND more than doubles 2008 survey, some say figure still conservative