@misc{indiciae6ea34032ea12,
  title = {Reconnaissance geologic map of the Medano Pass Quadrangle and part of the Liberty Quadrangle, Alamosa, Huerfano, and Saguache counties, Colorado},
  author = {B. R. Johnson and R.M. Bruce and D. A. Lindsey},
  year = {1989},
  doi = {10.3133/mf2089},
  url = {https://pubs.usgs.gov/publication/mf2089},
  note = {Source identifier: mf2089}
}