Assessment of undiscovered conventional oil and gas resources in the lower Paleozoic of the Williston Basin Province, 2020 - Schenk, Christopher; Mercier, Tracey; Woodall, Cheryl; Ellis, Geoffrey; Finn, Thomas; Le, Phuong; Marra, Kristen; Leathers-Miller, Heidi; Drake II, Ronald M. (Fact Sheet, 2021)