@misc{indiciaeaa1398b9595c,
  title = {Rock-stratigraphic nomenclature, lithology, and subcrop area of the Galena-Platteville bedrock unit in Illinois and Wisconsin},
  author = {W. G. Batten and T.A. Brown and P. C. Mills and T. J. Sabin},
  year = {1997},
  doi = {10.3133/wri974054b},
  url = {https://pubs.usgs.gov/publication/wri974054B},
  note = {Source identifier: wri974054B}
}