@misc{indiciae339f4dc3a21f,
  title = {Coal exploratory holes drilled in 1980 in the Birney 1 degree x 2 degrees quadrangle, Powder River and Big Horn Counties, Montana},
  author = {W.C. Culbertson},
  year = {1981},
  doi = {10.3133/ofr811329},
  url = {https://pubs.usgs.gov/publication/ofr811329},
  note = {Source identifier: ofr811329}
}