@misc{indiciae4dab90a9540f,
  title = {Pegmatites and other Precambrian Rocks in the Southern Black Hills; Geology and mineral deposits of some pegmatites in the southern Black Hills, South Dakota},
  author = {James J. Norton},
  year = {1964},
  doi = {10.3133/pp297e},
  url = {https://pubs.usgs.gov/publication/pp297E},
  note = {Source identifier: pp297E}
}