@misc{indiciaeb8061d618024,
  title = {Contributions to economic geology 1906 : Part I - metals and nonmetals except fuels},
  author = {Samuel Franklin Emmons and Edwin C. Eckel},
  year = {1907},
  doi = {10.3133/b315},
  url = {https://pubs.usgs.gov/publication/b315},
  note = {Source identifier: b315}
}