@misc{indiciae13b8a6e329d1,
  title = {Simple Bouguer gravity map of the Paducah 1° x 2° quadrangle, Illinois, Kentucky, and Missouri},
  author = {T.G. Hildenbrand and R.P. Kucks and M. F. Kane},
  year = {1979},
  doi = {10.3133/ofr791179},
  url = {https://pubs.usgs.gov/publication/ofr791179},
  note = {Source identifier: ofr791179}
}