@misc{indiciae43590525eea1,
  title = {Preliminary description of cores, chemical analyses of lignite beds, and map showing locations of holes drilled in Grant, Hettinger, Morton, and Stark Counties, North Dakota},
  author = {H.L. Smith},
  year = {1970},
  doi = {10.3133/ofr70308},
  url = {https://pubs.usgs.gov/publication/ofr70308},
  note = {Source identifier: ofr70308}
}