@misc{indiciae9796f90794ea,
  title = {Geology of the Brockton quadrangle, Montana},
  author = {Roger B. Colton},
  year = {1955},
  doi = {10.3133/ofr5530},
  url = {https://pubs.usgs.gov/publication/ofr5530},
  note = {Source identifier: ofr5530}
}