Oil Patch Refinery

Gov. Jack Dalrymple announces a new diesel refinery in North Dakota at a press conference in Bismarck, N.D. on Thursday, Feb. 7, 2013. MDU Resources Group Inc. says it will build the diesel refinery near Dickinson in western North Dakota's booming oil patch starting this spring. (AP Photo/James MacPherson)
Gov. Jack Dalrymple announces a new diesel refinery in North Dakota at a press conference in Bismarck, N.D. on Thursday, Feb. 7, 2013. MDU Resources Group Inc. says it will build the diesel refinery near Dickinson in western North Dakota's booming oil patch starting this spring. (AP Photo/James MacPherson)

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