@misc{indiciae8b6a6670319a,
  title = {Interpretation of the aeromagnetic pattern of the San Juan primitive area, Colorado},
  author = {Peter Popenoe and Thomas August Steven},
  year = {1969},
  doi = {10.3133/ofr69211},
  url = {https://pubs.usgs.gov/publication/ofr69211},
  note = {Source identifier: ofr69211}
}