@misc{indiciae3bde85d18661,
  title = {Map showing the thickness and character of quaternary sediments in the glaciated United States East of the Rocky Mountains},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey and David R. Soller},
  year = {2001},
  doi = {10.3133/i1970e},
  url = {https://pubs.usgs.gov/publication/i1970E},
  note = {Source identifier: i1970E}
}