@misc{indiciaeca99badb169c,
  title = {Total intensity aeromagnetic map of Orange County, Indiana},
  author = {John R. Henderson and J. L. Meuschke},
  year = {1951},
  doi = {10.3133/gp69},
  url = {https://pubs.usgs.gov/publication/gp69},
  note = {Source identifier: gp69}
}