@misc{indiciaede6a307032fe,
  title = {The Garrison and Philipsburg phosphate fields, Montana},
  author = {J. T. Pardee},
  year = {1917},
  doi = {10.3133/b640k},
  url = {https://pubs.usgs.gov/publication/b640K},
  note = {Source identifier: b640K}
}