@misc{indiciae05cfed92b092,
  title = {Maps and seismic profiles showing thickness and distribution of postglacial deposits beneath the southern two-thirds of Lake Michigan},
  author = {Steven M. Colman},
  year = {1992},
  doi = {10.3133/i2202},
  url = {https://pubs.usgs.gov/publication/i2202},
  note = {Source identifier: i2202}
}