@misc{indiciaef7e3c5cfd65f,
  title = {Preliminary report on the geology of the Harmon and Hansen lignite beds in the southern half of the Bowman-Gascoyne area, Slope, Bowman, and Adams counties, North Dakota},
  author = {Robert C. Lewis},
  year = {1977},
  doi = {10.3133/ofr77377},
  url = {https://pubs.usgs.gov/publication/ofr77377},
  note = {Source identifier: ofr77377}
}