@misc{indiciae855c33d470e2,
  title = {Petrology and petrography for USGS test wells 1, 2, and 3 in the Madison Limestone in Montana and Wyoming},
  author = {Paul A. Thayer},
  year = {1981},
  doi = {10.3133/ofr81221},
  url = {https://pubs.usgs.gov/publication/ofr81221},
  note = {Source identifier: ofr81221}
}