@misc{indiciaeca92fdb578ef,
  title = {Mineral resources of the region around Boulder Dam},
  author = {D. F. Hewett and Eugene Callaghan and B.N. Moore and T. B. Nolan and W.W. Rubey and W. T. Schaller},
  year = {1936},
  doi = {10.3133/b871},
  url = {https://pubs.usgs.gov/publication/b871},
  note = {Source identifier: b871}
}