@misc{indiciaedcf343720bd5,
  title = {Reconnaissance map of the Willishaw Flats anticlinal nose, Toole County, Montana},
  author = {C. E. Erdmann},
  year = {1939},
  doi = {10.3133/ofr393},
  url = {https://pubs.usgs.gov/publication/ofr393},
  note = {Source identifier: ofr393}
}