@misc{indiciaefaee80878210,
  title = {Nickel deposit near Gold Hill, Boulder County, Colorado},
  author = {E. N. Coddard and T. S. Lovering},
  year = {1942},
  doi = {10.3133/b931o},
  url = {https://pubs.usgs.gov/publication/b931O},
  note = {Source identifier: b931O}
}