@misc{indiciae19fe812f185b,
  title = {Metallogenic map of stratabound exhalative and related occurrences in Colorado},
  author = {D. M. Sheridan and R.L. Earhart and R. B. Taylor and J.W. Hasler},
  year = {1990},
  doi = {10.3133/i1971},
  url = {https://pubs.usgs.gov/publication/i1971},
  note = {Source identifier: i1971}
}