@misc{indiciaef1f1b75d569e,
  title = {Map showing thickness and character of Quaternary sediments in the glaciated United States east of the Rocky Mountains; northeastern states, the Great Lakes, and parts of southern Ontario and the Atlantic offshore area (east of 80 degrees 31 minutes west longitude)},
  author = {D. R. Soller},
  year = {1993},
  doi = {10.3133/i1970a},
  url = {https://pubs.usgs.gov/publication/i1970A},
  note = {Source identifier: i1970A}
}