@misc{indiciae476e3ece93e4,
  title = {Surficial geologic map of the Walden 30' x 60' quadrangle, Jackson, Larimer, and Routt counties, Colorado},
  author = {R.F. Madole},
  year = {1991},
  doi = {10.3133/i1824},
  url = {https://pubs.usgs.gov/publication/i1824},
  note = {Source identifier: i1824}
}