@misc{indiciae78a12346ded5,
  title = {The lignite deposits of the Cheyenne River and Standing Rock Indian Reservations Corson, Dewey, And Ziebach counties, South Dakota and Sioux county, North Dakota},
  author = {Norman M. Denson},
  year = {1950},
  doi = {10.3133/cir78},
  url = {https://pubs.usgs.gov/publication/cir78},
  note = {Source identifier: cir78}
}