@misc{indiciaeacdfdf8a7ebe,
  title = {Introduction; Gold and silver},
  author = {Waldemar Lindgren and Donald Francis MacDonald and W. H. Emmons and Esper Signius Larsen and Joseph Bertram Umpleby and Frank Cathcart Calkins and E. L. Jones and Frank Charles Schrader and James Madison Hill},
  year = {1913},
  doi = {10.3133/b530a},
  url = {https://pubs.usgs.gov/publication/b530A},
  note = {Source identifier: b530A}
}