@misc{indiciaec83fdd273ff2,
  title = {Preliminary geologic map of the Walden quadrangle, North Park, Jackson County, Colorado},
  author = {Douglas M. Kinney and William J. Hail},
  year = {1970},
  doi = {10.3133/ofr70185},
  url = {https://pubs.usgs.gov/publication/ofr70185},
  note = {Source identifier: ofr70185}
}