@misc{indiciae6d1a7c9bf716,
  title = {Geologic map of the Denver West 30' x 60' quadrangle, north-central Colorado},
  author = {Karl S. Kellogg and Ralph R. Shroba and Bruce Bryant and Wayne R. Premo},
  year = {2008},
  doi = {10.3133/sim3000},
  url = {https://pubs.usgs.gov/publication/sim3000},
  note = {Source identifier: sim3000}
}