@misc{indiciaef66841e6cfe6,
  title = {Aeromagnetic map of central Iowa},
  author = {J. R. Henderson and J. L. Vargo},
  year = {1965},
  doi = {10.3133/gp476},
  url = {https://pubs.usgs.gov/publication/gp476},
  note = {Source identifier: gp476}
}