@misc{indiciae17e29392b23a,
  title = {Total intensity aeromagnetic map of Delaware County, Indiana},
  author = {John R. Henderson and J. L. Meuschke},
  year = {1951},
  doi = {10.3133/gp57},
  url = {https://pubs.usgs.gov/publication/gp57},
  note = {Source identifier: gp57}
}