@misc{indiciae8d7510a87052,
  title = {Petrographic data from the Lower Cretaceous Blackleaf Formation and lower Upper Cretaceous Frontier Formation (lower part) in Beaverhead and Madison counties, Montana},
  author = {T. S. Dyman},
  year = {1985},
  doi = {10.3133/ofr85592},
  url = {https://pubs.usgs.gov/publication/ofr85592},
  note = {Source identifier: ofr85592}
}