@misc{indiciaedae380353a60,
  title = {Coal drilling during 1980 in Big Horn, Dawson, McCone, Powder River, Prairie, Richland, Rosebud, and Treasure counties, Montana},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey and Montana Bureau of Mines and Geology},
  year = {1981},
  doi = {10.3133/ofr8226},
  url = {https://pubs.usgs.gov/publication/ofr8226},
  note = {Source identifier: ofr8226}
}