@misc{indiciaea6e0352bdbdf,
  title = {Potosi Lead-Zinc Area, Grant County, Wisconsin},
  author = {Allen P. Agnew and Allen V. Heyl},
  year = {1943},
  doi = {10.3133/ofr4311},
  url = {https://pubs.usgs.gov/publication/ofr4311},
  note = {Source identifier: ofr4311}
}