@misc{indiciae1b2ed815c79e,
  title = {Preliminary geologic map of the northeast part of the Edgemont NE quadrangle, Custer and Fall River Counties, South Dakota},
  author = {G. B. Gott and R. W. Schnabel},
  year = {1956},
  doi = {10.3133/mf56},
  url = {https://pubs.usgs.gov/publication/mf56},
  note = {Source identifier: mf56}
}