@misc{indiciae5be6131ffa6d,
  title = {Geology of the Hugo pegmatite, Keystone, South Dakota},
  author = {J.J. Norton and L. R. Page and D.A. Brobst},
  year = {1962},
  doi = {10.3133/pp297b},
  url = {https://pubs.usgs.gov/publication/pp297B},
  note = {Source identifier: pp297B}
}