@misc{indiciae5e31be0402fb,
  title = {Preliminary interpretation of an aeromagnetic survey in north-central Iowa},
  author = {John Richard Henderson and Walter S. White and Isidore Zietz},
  year = {1963},
  doi = {10.3133/ofr6345},
  url = {https://pubs.usgs.gov/publication/ofr6345},
  note = {Source identifier: ofr6345}
}