@misc{indiciae12c6f0b483a6,
  title = {Digital representation of a map showing the thickness and character of Quaternary sediments in the glaciated United States east of the Rocky Mountains},
  author = {D. R. Soller and Patricia H. Packard},
  year = {1998},
  doi = {10.3133/ds38},
  url = {https://pubs.usgs.gov/publication/ds38},
  note = {Source identifier: ds38}
}