@misc{indiciae53412f8d392d,
  title = {Geology and ore deposits of the Philipsburg quadrangle, Montana},
  author = {William Harvey Emmons and Frank Cathcart Calkins},
  year = {1913},
  doi = {10.3133/pp78},
  url = {https://pubs.usgs.gov/publication/pp78},
  note = {Source identifier: pp78}
}