@misc{indiciae624400b399e3,
  title = {The Bull mountain coal field, Musselshell and Yellowstone counties, Montana},
  author = {Lester Hood Woolsey and Ralph Webster Richards and Charles Thomas Lupton},
  year = {1917},
  doi = {10.3133/b647},
  url = {https://pubs.usgs.gov/publication/b647},
  note = {Source identifier: b647}
}