@misc{indiciae84fbd2af34cc,
  title = {Bedrock geology map of Walworth County, Wisconsin},
  author = {Ronald G. Borman},
  year = {1976},
  doi = {10.3133/ofr76462},
  url = {https://pubs.usgs.gov/publication/ofr76462},
  note = {Source identifier: ofr76462}
}