@misc{indiciae3c7fff336bcf,
  title = {Geology and pegmatites of the Fourmile quadrangle, Black Hills, South Dakota},
  author = {J. A. Redden},
  year = {1963},
  doi = {10.3133/pp297d},
  url = {https://pubs.usgs.gov/publication/pp297D},
  note = {Source identifier: pp297D}
}