@misc{indiciae1e49c60c8f62,
  title = {Map showing the thickness and character of Quaternary sediments in the glaciated United States east of the Rocky Mountains: Northern and central plains states (90° to 102° west longitude)},
  author = {D. R. Soller},
  year = {1997},
  doi = {10.3133/i1970c},
  url = {https://pubs.usgs.gov/publication/i1970C},
  note = {Source identifier: i1970C}
}