@misc{indiciae67e05e603672,
  title = {Geologic map and distribution of heavy minerals in Tertiary rocks of the Birney 30' x 60' Quadrangle, Big Horn, Rosebud, and Powder River counties, Montana},
  author = {N.M. Denson and D. L. Macke and R.R. Schumann and M.E. Durrett},
  year = {1990},
  doi = {10.3133/i2019},
  url = {https://pubs.usgs.gov/publication/i2019},
  note = {Source identifier: i2019}
}