Assessment of Undiscovered Oil Resources in the Devonian-Mississippian Bakken Formation, Williston Basin Province, Montana and North Dakota, 2008 - Pollastro, Richard; Cook, Troy; Roberts, Laura; Schenk, Christopher; Lewan, Michael D.; Anna, Lawrence; Gaswirth, Stephanie B.; Lillis, Paul; Klett, Timothy R.; Charpentier, Ronal (Fact Sheet, 2008)