@misc{indiciae51ecf8033881,
  title = {Geologic map of the Sherburne quadrangle, northeastern Kentucky},
  author = {William F. Outerbridge},
  year = {1970},
  doi = {10.3133/gq854},
  url = {https://pubs.usgs.gov/publication/gq854},
  note = {Source identifier: gq854}
}