@misc{indiciaef602e6eefb49,
  title = {The coal resources of McCone County, Montana},
  author = {Arthur James Collier and Maxwell McMichael Knechtel},
  year = {1939},
  doi = {10.3133/b905},
  url = {https://pubs.usgs.gov/publication/b905},
  note = {Source identifier: b905}
}