@misc{indiciae68c8ccbc1200,
  title = {Bedrock topography of Waukesha County, Wisconsin},
  author = {Joseph B. Gonthier},
  year = {1975},
  doi = {10.3133/ofr75572},
  url = {https://pubs.usgs.gov/publication/ofr75572},
  note = {Source identifier: ofr75572}
}