@misc{indiciae40ade932005e,
  title = {Aeromagnetic map of part of the San Juan Mountains, southwestern Colorado},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1987},
  doi = {10.3133/ofr87423},
  url = {https://pubs.usgs.gov/publication/ofr87423},
  note = {Source identifier: ofr87423}
}