@misc{indiciae568c49de40db,
  title = {Northwest quarter of the Boulder quadrangle, Montana},
  author = {G.E. Becraft and D. M. Pinckney},
  year = {1961},
  doi = {10.3133/mf183},
  url = {https://pubs.usgs.gov/publication/mf183},
  note = {Source identifier: mf183}
}