@misc{indiciae211abf75fce0,
  title = {Geologic map of the Melber quadrangle, Graves and McCracken Counties, Kentucky},
  author = {Roger Warren Swanson},
  year = {1970},
  doi = {10.3133/gq860},
  url = {https://pubs.usgs.gov/publication/gq860},
  note = {Source identifier: gq860}
}