@misc{indiciae3ce670e6ac4e,
  title = {Geomorphology and Quaternary geology of the glaciated Ohio River valley — A reconnaissance study},
  author = {Louis L. Ray},
  year = {1974},
  doi = {10.3133/pp826},
  url = {https://pubs.usgs.gov/publication/pp826},
  note = {Source identifier: pp826}
}