@misc{indiciae4908d9eaa6f9,
  title = {Complete Bouguer gravity anomaly, isostatic-residual gravity, horizontal gradient, and terrain maps of Colorado},
  author = {G. A. Abrams and D. H. Knepper},
  year = {1994},
  doi = {10.3133/gp1009},
  url = {https://pubs.usgs.gov/publication/gp1009},
  note = {Source identifier: gp1009}
}