@misc{indiciae99ef0c0cf7fd,
  title = {Mineral resources of the Hack Lake Wilderness Study Area, Garfield County, Colorado},
  author = {Sandra J. Soulliere and Mark A. Arnold and Steven E. Kluender},
  year = {1985},
  doi = {10.3133/b1717a},
  url = {https://pubs.usgs.gov/publication/b1717A},
  note = {Source identifier: b1717A}
}