@misc{indiciae1634d1952fc2,
  title = {Stripping coal deposits of the northern Great Plains, Montana, Wyoming, North Dakota, and South Dakota},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1974},
  doi = {10.3133/mf590},
  url = {https://pubs.usgs.gov/publication/mf590},
  note = {Source identifier: mf590}
}