@misc{indiciae067e3b785d19,
  title = {Geologic map of the Durango Quadrangle, southwestern Colorado},
  author = {T. A. Steven and P. W. Lipman and W. J. Hail and Fred Barker and R. G. Luedke},
  year = {1974},
  doi = {10.3133/i764},
  url = {https://pubs.usgs.gov/publication/i764},
  note = {Source identifier: i764}
}