@misc{indiciae8e853f381e3d,
  title = {Isopach and lithofacies map of the Sauk sequence (excluding basal clastics) in the northern Midcontinent, U.S.A.},
  author = {W. P. Pratt},
  year = {1987},
  doi = {10.3133/mf1835d},
  url = {https://pubs.usgs.gov/publication/mf1835D},
  note = {Source identifier: mf1835D}
}