@misc{indiciae7f5f36dd8c31,
  title = {Aeromagnetic map of the Black Ridge Canyon area, western Colorado},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1987},
  doi = {10.3133/ofr87337},
  url = {https://pubs.usgs.gov/publication/ofr87337},
  note = {Source identifier: ofr87337}
}