@misc{indiciae8b39fd1f44bb,
  title = {Preliminary geologic map of the northeast part of the Burdock quadrangle, Fall River and Custer Counties, South Dakota},
  author = {R. W. Schnabel and L.J. Charlesworth},
  year = {1958},
  doi = {10.3133/mf72},
  url = {https://pubs.usgs.gov/publication/mf72},
  note = {Source identifier: mf72}
}