@misc{indiciae5d87ce4766a2,
  title = {Geology of the Edgemont quadrangle, Fall River County, South Dakota},
  author = {John Donald Ryan},
  year = {1964},
  doi = {10.3133/b1063j},
  url = {https://pubs.usgs.gov/publication/b1063J},
  note = {Source identifier: b1063J}
}