@misc{indiciae93bca9858932,
  title = {Map showing bedrock-surface topography of the Toledo area, northwestern Ohio and southeastern Michigan},
  author = {Gerald L. Shideler and Byron D. Stone and G.E. Larsen},
  year = {1996},
  doi = {10.3133/mf2309},
  url = {https://pubs.usgs.gov/publication/mf2309},
  note = {Source identifier: mf2309}
}