@misc{indiciae150608ac1776,
  title = {Aeromagnetic map of the southeastern part of the Billings 1° by 2° quadrangle, Montana},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1975},
  doi = {10.3133/ofr75656},
  url = {https://pubs.usgs.gov/publication/ofr75656},
  note = {Source identifier: ofr75656}
}