@misc{indiciae67a9b2147d37,
  title = {Map showing bedrock topography and subcrop of selected beds beneath alluvial deposits of the Grove Center Quadrangle and part of the Shawneetown Quadrangle, Kentucky-Illinois},
  author = {A. E. Smith},
  year = {1976},
  doi = {10.3133/i954},
  url = {https://pubs.usgs.gov/publication/i954},
  note = {Source identifier: i954}
}