@misc{indiciae3859850968b1,
  title = {Bedrock topography map of Walworth County, Wisconsin},
  author = {Ronald G. Borman},
  year = {1976},
  doi = {10.3133/ofr76463},
  url = {https://pubs.usgs.gov/publication/ofr76463},
  note = {Source identifier: ofr76463}
}