@misc{indiciaeca6973ecd7bd,
  title = {Preliminary map showing surficial deposits in the south half of the Coopers Lake Quadrangle, Powell County, Montana},
  author = {Irving Jerome Witkind},
  year = {1977},
  doi = {10.3133/ofr77466},
  url = {https://pubs.usgs.gov/publication/ofr77466},
  note = {Source identifier: ofr77466}
}