@misc{indiciae3201631f5ff4,
  title = {Coal resource occurrence map of the Emmet SE Quadrangle, Mercer and McLean counties, North Dakota},
  author = {Woodward-Clyde Consultants},
  year = {1978},
  doi = {10.3133/ofr78991},
  url = {https://pubs.usgs.gov/publication/ofr78991},
  note = {Source identifier: ofr78991}
}