@misc{indiciaea4c8db3e9bd4,
  title = {Stratigraphic sections of the Phosphoria formation in Montana, 1947-48},
  author = {Roger Warren Swanson and W.R. Lowell and E. R. Cressman and D.A. Bostwick},
  year = {1953},
  doi = {10.3133/cir209},
  url = {https://pubs.usgs.gov/publication/cir209},
  note = {Source identifier: cir209}
}