@misc{indiciae6cb159902b6f,
  title = {Map showing metallic mineral deposits of Montana},
  author = {Fred M. Chace and V. P. Byers and H.L. Cannon and F.W. Cater and Juanita Crawford and M. H. Krieger and W. B. Myers},
  year = {1947},
  doi = {10.3133/mb16},
  url = {https://pubs.usgs.gov/publication/mb16},
  note = {Source identifier: mb16}
}