In this Tuesday, July 26, 2011 photo, Austin Mitchell walks away from an oil derrick outside of Williston, N.D. With what many are calling the largest oil boom in recent North American history, ... more 
In this Tuesday, July 26, 2011 photo, Austin Mitchell walks away from an oil derrick outside of Williston, N.D. With what many are calling the largest oil boom in recent North American history, temporary housing for the huge influx of workers, known as "man camps," now dot the sparse North Dakota landscape. (AP Photo/Gregory Bull) less 
1 / 1
Associated Press | Photo By Gregory Bull
Thu, Sep 1, 2011 4:43 PM EDT