@misc{indiciae6ec359586b4c,
  title = {Maps showing thickness and limestone-dolostone ratios of selected Paleozoic carbonate units in the northern Midcontinent, U.S.A.; folio of the northern Midcontinent area},
  author = {W. P. Pratt and C. J. Wandrey},
  year = {1996},
  doi = {10.3133/mf1835i},
  url = {https://pubs.usgs.gov/publication/mf1835I},
  note = {Source identifier: mf1835I}
}