@misc{indiciaee73bd63f8a13,
  title = {Aeromagnetic map of North Carolina},
  author = {Isidore Zietz and F. E. Riggle and F. P. Gilbert},
  year = {1984},
  doi = {10.3133/gp957},
  url = {https://pubs.usgs.gov/publication/gp957},
  note = {Source identifier: gp957}
}