@misc{indiciaee9b456988dd2,
  title = {Geologic map of the Salyersville South Quadrangle, Magoffin and Breathitt counties, Kentucky},
  author = {Richard W. Spengler},
  year = {1976},
  doi = {10.3133/ofr76565},
  url = {https://pubs.usgs.gov/publication/ofr76565},
  note = {Source identifier: ofr76565}
}