@misc{indiciaeebcf60a4b3d8,
  title = {Database for USGS Map I-1970 - Map showing the thickness and character of Quaternary sediments in the glaciated United States east of the Rocky Mountains},
  author = {D. R. Soller and P.H. Packard and C.P. Garrity},
  year = {2012},
  doi = {10.3133/ds656},
  url = {https://pubs.usgs.gov/publication/ds656},
  note = {Source identifier: ds656}
}