@misc{indiciae52565ecf16d3,
  title = {Preliminary report of coal drillhole data and chemical analyses of coal beds in Campbell and Sheridan Counties, Wyoming; Custer, Prairie, and Garfield Counties, Montana; and Mercer County, North Dakota},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1976},
  doi = {10.3133/ofr76319},
  url = {https://pubs.usgs.gov/publication/ofr76319},
  note = {Source identifier: ofr76319}
}