@misc{indiciaeaf04dd3c7d50,
  title = {The Phosphoria, Park City, and Shedhorn formations in the western phosphate field},
  author = {V.E. McKelvey and James S. Williams and R. P. Sheldon and E. R. Cressman and T. M. Cheney and R. W. Swanson},
  year = {1959},
  doi = {10.3133/pp313a},
  url = {https://pubs.usgs.gov/publication/pp313A},
  note = {Source identifier: pp313A}
}