@misc{indiciae77b986aa6f66,
  title = {Map showing thickness of unconsolidated materials of Walworth County, Wisconsin},
  author = {Ronald G. Borman},
  year = {1976},
  doi = {10.3133/ofr76465},
  url = {https://pubs.usgs.gov/publication/ofr76465},
  note = {Source identifier: ofr76465}
}