@misc{indiciae90020797f60c,
  title = {Assessment of undiscovered oil and gas resources of the Williston Basin Province of North Dakota, Montana, and South Dakota, 2010},
  author = {U.S. Geological Survey Williston Basin Province Assessment Team},
  year = {2011},
  doi = {10.3133/ds69w},
  url = {https://pubs.usgs.gov/publication/ds69W},
  note = {Source identifier: ds69W}
}