@misc{indiciae6a680257043a,
  title = {Geology of the Wrigley quadrangle, Kentucky},
  author = {John W. Hosterman and Sam H. Patterson and John Warfield Huddle},
  year = {1961},
  doi = {10.3133/gq170},
  url = {https://pubs.usgs.gov/publication/gq170},
  note = {Source identifier: gq170}
}