@misc{indiciaeffb120314ee7,
  title = {Aeromagnetic map of the northern Mississippi Embayment, parts of Missouri, Arkansas, Tennessee, and Kentucky},
  author = {T.G. Hildenbrand and Robert W. Johnson},
  year = {1977},
  doi = {10.3133/ofr77229},
  url = {https://pubs.usgs.gov/publication/ofr77229},
  note = {Source identifier: ofr77229}
}