@misc{indiciae5abf527024b4,
  title = {Geologic maps of Hugo pegmatite and part of Keystone district, South Dakota},
  author = {James Jennings Norton},
  year = {1960},
  doi = {10.3133/ofr60107},
  url = {https://pubs.usgs.gov/publication/ofr60107},
  note = {Source identifier: ofr60107}
}