@misc{indiciae5d1eb5c24201,
  title = {Contributions to economic geology, 1903},
  author = {Samuel Franklin Emmons and C. W. Hayes},
  year = {1904},
  doi = {10.3133/b225},
  url = {https://pubs.usgs.gov/publication/b225},
  note = {Source identifier: b225}
}