@misc{indiciae6d3547787582,
  title = {Geology of the Chelsea and Poplar quadrangles, Montana},
  author = {Roger B. Colton},
  year = {1954},
  doi = {10.3133/ofr5454},
  url = {https://pubs.usgs.gov/publication/ofr5454},
  note = {Source identifier: ofr5454}
}