@misc{indiciaecc5937e57a12,
  title = {Aeromagnetic map of the Wolcott-Boulder area, north-central Colorado},
  author = {E.P. Smith and B.D. Marcellus},
  year = {1968},
  doi = {10.3133/ofr68295},
  url = {https://pubs.usgs.gov/publication/ofr68295},
  note = {Source identifier: ofr68295}
}