@misc{indiciae388c45bf1df1,
  title = {Stratigraphy and structure of the northern and western flanks of the Black Hills uplift, Wyoming, Montana, and South Dakota},
  author = {Charles Sherwood Robinson and W. J. Mapel and M.H. Bergendahl},
  year = {1964},
  doi = {10.3133/pp404},
  url = {https://pubs.usgs.gov/publication/pp404},
  note = {Source identifier: pp404}
}