@misc{indiciaefcf4652bf2c1,
  title = {Trace elements reconnaissance in Indiana, Illinois, Missouri, Arkansas, and Kentucky : preliminary report},
  author = {John Marshall Nelson and Edward V. Stratton},
  year = {1949},
  doi = {10.3133/tei34},
  url = {https://pubs.usgs.gov/publication/tei34},
  note = {Source identifier: tei34}
}