@misc{indiciaeb7e4677eef07,
  title = {Contributions to economic geology, 1905},
  author = {Samuel Franklin Emmons and Edwin C. Eckel},
  year = {1906},
  doi = {10.3133/b285},
  url = {https://pubs.usgs.gov/publication/b285},
  note = {Source identifier: b285}
}