@misc{indiciaee7ab90db8086,
  title = {Map showing bedrock topography and subcrop of selected beds beneath alluvium deposits of the Delaware quadrangle, western Kentucky},
  author = {R. L. Norris},
  year = {1973},
  doi = {10.3133/i825},
  url = {https://pubs.usgs.gov/publication/i825},
  note = {Source identifier: i825}
}