@misc{indiciaeba09a99e5763,
  title = {Geology and ore deposits of the upper Blue River area, Summit County, Colorado},
  author = {Quentin Dreyer Singewald},
  year = {1951},
  doi = {10.3133/b970},
  url = {https://pubs.usgs.gov/publication/b970},
  note = {Source identifier: b970}
}