@misc{indiciaefe771c4bb440,
  title = {Digitized aeromagnetic map of the Columbus-Dayton area, Ohio and Indiana},
  author = {J. B. Harlan and R.W. Simpson and Martin Francis Kane},
  year = {1979},
  doi = {10.3133/ofr79928},
  url = {https://pubs.usgs.gov/publication/ofr79928},
  note = {Source identifier: ofr79928}
}