@misc{indiciae7faf1141bf59,
  title = {Contributions to economic geology, 1906, Part I, Metals and nonmetals except fuels--Iron and Manganese Ores},
  author = {Ernest Francis Burchard and Philip Sidney Smith and Arthur Coe Spencer and Sydney Hobart Ball},
  year = {1907},
  doi = {10.3133/b315d},
  url = {https://pubs.usgs.gov/publication/b315D},
  note = {Source identifier: b315D}
}