@misc{indiciaec102e7634356,
  title = {Stratigraphy and biostratigraphy of Mississippian rocks at Pentagon Mountain, Lewis and Clark Range, Montana},
  author = {K. M. Nichols},
  year = {1986},
  doi = {10.3133/ofr8684},
  url = {https://pubs.usgs.gov/publication/ofr8684},
  note = {Source identifier: ofr8684}
}