@misc{indiciae4b0ccecba063,
  title = {Physical stratigraphy of the Phosphoria formation in part of southwestern Montana},
  author = {E. R. Cressman},
  year = {1955},
  doi = {10.3133/b1027a},
  url = {https://pubs.usgs.gov/publication/b1027A},
  note = {Source identifier: b1027A}
}