@misc{indiciae6e4f52e7c27b,
  title = {Maps showing the thickness and character of Quaternary sediments in the glaciated United States east of the Rocky Mountains-northern plains states (west of 102 degrees west longitude)},
  author = {D. R. Soller},
  year = {1994},
  doi = {10.3133/i1970d},
  url = {https://pubs.usgs.gov/publication/i1970D},
  note = {Source identifier: i1970D}
}