@misc{indiciae78ef1847c214,
  title = {Geologic map of the Walsenburg area, Huerfano County, Colorado},
  author = {Ross Byron Johnson and James G. Stephens},
  year = {1955},
  doi = {10.3133/om161},
  url = {https://pubs.usgs.gov/publication/om161},
  note = {Source identifier: om161}
}