@misc{indiciaead2f1423e2ef,
  title = {Map showing bedrock topography and subcrop of selected beds beneath alluvial deposits of the Beech Grove Quadrangle, western Kentucky},
  author = {R. L. Norris},
  year = {1975},
  doi = {10.3133/i887},
  url = {https://pubs.usgs.gov/publication/i887},
  note = {Source identifier: i887}
}