@misc{indiciae107bff1b5617,
  title = {Geologic map of the Head of Grassy quadrangle, Lewis County, Kentucky},
  author = {Robert Hamilton Morris},
  year = {1966},
  doi = {10.3133/gq484},
  url = {https://pubs.usgs.gov/publication/gq484},
  note = {Source identifier: gq484}
}