@misc{indiciae7e9609ee67b6,
  title = {Total intensity aeromagnetic map of Potosi quadrangle, Missouri},
  author = {William J. Dempsey and R. T. Duffner and Fred Keller and J. R. Hnederson},
  year = {1950},
  doi = {10.3133/gp13},
  url = {https://pubs.usgs.gov/publication/gp13},
  note = {Source identifier: gp13}
}