@misc{indiciaefd1762b63546,
  title = {Geologic map of the Houston Gulch quadrangle, Gunnison and Saguache Counties, Colorado},
  author = {Jerry C. Olson},
  year = {1975},
  doi = {10.3133/ofr7562},
  url = {https://pubs.usgs.gov/publication/ofr7562},
  note = {Source identifier: ofr7562}
}