@misc{indiciae416e854c7053,
  title = {Map of mines, prospects, and patented mining claims, and classification of mineral deposits in the Flint Hill 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/ofr87261j},
  url = {https://pubs.usgs.gov/publication/ofr87261J},
  note = {Source identifier: ofr87261J}
}