@misc{indiciae04148955036b,
  title = {Mineral resources of the Ruby Mountains Wilderness Study Area, Madison County, Montana},
  author = {R. G. Tysdal and G. K. Lee and J. H. Hassemer and W. F. Hanna and S. W. Schmauch},
  year = {1987},
  doi = {10.3133/b1724a},
  url = {https://pubs.usgs.gov/publication/b1724A},
  note = {Source identifier: b1724A}
}