@misc{indiciae10cc20ad7c3f,
  title = {Aeromagnetic map of parts of the Galena and Miles quadrangles, Jo Daviess County, Illinois},
  author = {William J. Dempsey and John R. Kirby},
  year = {1958},
  doi = {10.3133/ofr5831},
  url = {https://pubs.usgs.gov/publication/ofr5831},
  note = {Source identifier: ofr5831}
}