@misc{indiciae369a77d752f6,
  title = {Preliminary map showing thickness of glacial deposits in Wisconsin},
  author = {R. G. Borman},
  year = {1971},
  doi = {10.3133/ofr7152},
  url = {https://pubs.usgs.gov/publication/ofr7152},
  note = {Source identifier: ofr7152}
}