@misc{indiciaee5848b865075,
  title = {Geologic map of the complex of alkalic rocks at Iron Hill, Gunnison County, Colorado},
  author = {D. C. Hedlund and J. C. Olson},
  year = {1968},
  doi = {10.3133/ofr68124},
  url = {https://pubs.usgs.gov/publication/ofr68124},
  note = {Source identifier: ofr68124}
}