@misc{indiciae0fa32f3615b5,
  title = {Aeromagnetic map of the Plains, Perma, Superior, and Tarkio quadrangles, Sanders, Mineral, and Missoula Counties, Montana},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1969},
  doi = {10.3133/gp691},
  url = {https://pubs.usgs.gov/publication/gp691},
  note = {Source identifier: gp691}
}