@misc{indiciae686b11991a0e,
  title = {Aeromagnetic map of Iowa},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1976},
  doi = {10.3133/gp910},
  url = {https://pubs.usgs.gov/publication/gp910},
  note = {Source identifier: gp910}
}