@misc{indiciae3489d9d03005,
  title = {Hydrogeologic framework for characterization and occurrence of confined and unconfined aquifers in quaternary sediments in the glaciated conterminous United States—A digital map compilation and database},
  author = {Adel E. Haj and David R. Soller and James E. Reddy and Leon J. Kauffman and Richard M. Yager and Cheryl A. Buchwald},
  year = {2018},
  doi = {10.3133/ds1090},
  url = {https://pubs.usgs.gov/publication/ds1090},
  note = {Source identifier: ds1090}
}