@misc{indiciaeb761c68420ac,
  title = {Geologic map of the Bailey 30' x 60' quadrangle, North-Central Colorado},
  author = {Chester A. Ruleman and Robert G. Bohannon and Bruce Bryant and Ralph R. Shroba and Wayne R. Premo},
  year = {2011},
  doi = {10.3133/sim3156},
  url = {https://pubs.usgs.gov/publication/sim3156},
  note = {Source identifier: sim3156}
}