@misc{indiciaec1e62df635f3,
  title = {Geology of the Ironton quadrangle, Colorado},
  author = {Wilbur S. Burbank and Robert G. Luedke},
  year = {1964},
  doi = {10.3133/gq291},
  url = {https://pubs.usgs.gov/publication/gq291},
  note = {Source identifier: gq291}
}