@misc{indiciae1a72c2f4413f,
  title = {Edgemont folio, South Dakota-Nebraska},
  author = {Nelson Horatio Darton and William Sidney Tangier Smith},
  year = {1904},
  doi = {10.3133/gf108},
  url = {https://pubs.usgs.gov/publication/gf108},
  note = {Source identifier: gf108}
}