@misc{indiciae464757e465a9,
  title = {Aeromagnetic map of Colorado},
  author = {Isidore Zietz and John R. Kirby},
  year = {1972},
  doi = {10.3133/gp836},
  url = {https://pubs.usgs.gov/publication/gp836},
  note = {Source identifier: gp836}
}