@misc{indiciaeb0f614c4ff7e,
  title = {Geologic map of the Corral Bluffs quadrangle, El Paso County, Colorado},
  author = {Paul E. Soister},
  year = {1968},
  doi = {10.3133/gq783},
  url = {https://pubs.usgs.gov/publication/gq783},
  note = {Source identifier: gq783}
}