@misc{indiciae14b53921cb62,
  title = {Aeromagnetic map of parts of the Denver, Greeley, and Pueblo 1 x 2 degree quadrangles, Colorado},
  author = {F. E. Riggle and Isidore Zietz},
  year = {1994},
  doi = {10.3133/ofr94164},
  url = {https://pubs.usgs.gov/publication/ofr94164},
  note = {Source identifier: ofr94164}
}