@misc{indiciaecab3b33db13b,
  title = {Gold and silver},
  author = {Joseph Silas Diller and Henry Gardiner Ferguson},
  year = {1914},
  doi = {10.3133/b540a},
  url = {https://pubs.usgs.gov/publication/b540A},
  note = {Source identifier: b540A}
}