Assessment of undiscovered oil and gas resources of the Powder River Basin Province of Wyoming and Montana— 2006 update
Using a geology-based assessment method, the U.S. Geological Survey estimated means of 16.6 trillion cubic feet of undiscovered natural gas, 639 million barrels of undiscovered oil, and 131 million barrels of natural gas liquids in the Powder River Basin Province.
Montana, Wyoming↗