@misc{indiciaef84d69d54dd6,
  title = {Map showing locations of mines, prospects, and patented mining claims, and classification of mineral deposits in the Fourmile 7 1/2-minute quadrangle, Black Hills, South Dakota},
  author = {Ed DeWitt and David Buscher and A.B. Wilson and Thomas Johnson},
  year = {1988},
  doi = {10.3133/mf1978o},
  url = {https://pubs.usgs.gov/publication/mf1978O},
  note = {Source identifier: mf1978O}
}