@misc{indiciaeb45aaa5a1b6d,
  title = {Aeromagnetic and geologic map of part of northwestern Montana and northern Idaho},
  author = {M. D. Kleinkopf and J. E. Harrison and R. E. Zartman},
  year = {1972},
  doi = {10.3133/gp830},
  url = {https://pubs.usgs.gov/publication/gp830},
  note = {Source identifier: gp830}
}