@misc{indiciaec8c282c6b736,
  title = {Geologic map of the Olson Coulee South quadrangle, Dawson County, Montana},
  author = {R. B. Colton and J. P. McGraw and S.L. Durst},
  year = {1994},
  doi = {10.3133/ofr88621},
  url = {https://pubs.usgs.gov/publication/ofr88621},
  note = {Source identifier: ofr88621}
}