@misc{indiciaee9a177169930,
  title = {Bedrock geology of the Paducah 1° x 2° CUSMAP quadrangle, Illinois, Indiana, Kentucky, and Missouri},
  author = {W. John Nelson},
  year = {1998},
  doi = {10.3133/b2150b},
  url = {https://pubs.usgs.gov/publication/b2150B},
  note = {Source identifier: b2150B}
}