@misc{indiciae9293cba71e43,
  title = {Map of mines, prospects, and patented mining claims, and classification of mineral deposits in the Nemo 7 1/2 minute quadrangle, and the western one-third of the Piedmont 7 1/2 minute quadrangle, Black Hills, South Dakota},
  author = {Ed DeWitt and D. P. Buscher and A.B. Wilson and T.M. Johnson},
  year = {1988},
  doi = {10.3133/ofr87261d},
  url = {https://pubs.usgs.gov/publication/ofr87261D},
  note = {Source identifier: ofr87261D}
}