@misc{indiciae2410c12be89a,
  title = {Maps showing geology, structure, and geophysics of the central Black Hills, South Dakota},
  author = {Jack A. Redden and Ed DeWitt},
  year = {2008},
  doi = {10.3133/sim2777},
  url = {https://pubs.usgs.gov/publication/sim2777},
  note = {Source identifier: sim2777}
}