@misc{indiciae9d88c0a3b107,
  title = {Preliminary interpretation of an aeromagnetic survey in central and southwestern Iowa},
  author = {John Richard Henderson and Isidore Zietz and Walter S. White},
  year = {1963},
  doi = {10.3133/ofr6346},
  url = {https://pubs.usgs.gov/publication/ofr6346},
  note = {Source identifier: ofr6346}
}