@misc{indiciaef269508c78fb,
  title = {The stratigraphy of the Montana group, with special reference to the position and age of the Judith River Formation in north-central Montana},
  author = {C. F. Bowen},
  year = {1915},
  doi = {10.3133/pp90i},
  url = {https://pubs.usgs.gov/publication/pp90I},
  note = {Source identifier: pp90I}
}