@misc{indiciae8d62fd8bdff5,
  title = {Geologic map of the Spring Hill Creek Quadrangle, Saguache County, Colorado},
  author = {J. C. Olson and T. A. Steven and D. C. Hedlund},
  year = {1975},
  doi = {10.3133/mf713},
  url = {https://pubs.usgs.gov/publication/mf713},
  note = {Source identifier: mf713}
}