@misc{indiciae9085a42e9066,
  title = {Contributions to economic geology, 1905 : Iron and Manganese},
  author = {E.C. Eckel and E.M. Kindle and R.J. Holden and C. K. Leith},
  year = {1906},
  doi = {10.3133/b285e},
  url = {https://pubs.usgs.gov/publication/b285E},
  note = {Source identifier: b285E}
}