@misc{indiciae9e559acd8976,
  title = {The lignites of the Great Sioux Reservation, a report on the region between the Grand and Moreau rivers, Dakota},
  author = {Bailey Willis},
  year = {1885},
  doi = {10.3133/b21},
  url = {https://pubs.usgs.gov/publication/b21},
  note = {Source identifier: b21}
}