@misc{indiciaee008c4b4d484,
  title = {Corundum deposits of Gallatin and Madison Counties, Montana},
  author = {Stephen Edmund Clabaugh and F.C. Armstrong},
  year = {1950},
  doi = {10.3133/b969b},
  url = {https://pubs.usgs.gov/publication/b969B},
  note = {Source identifier: b969B}
}