@misc{indiciae28281dcdbfe8,
  title = {Geology of the Eureka pegmatite, Pennington County, South Dakota},
  author = {Roy Eldon Roadifer},
  year = {1954},
  doi = {10.3133/ofr54256},
  url = {https://pubs.usgs.gov/publication/ofr54256},
  note = {Source identifier: ofr54256}
}