@misc{indiciaefac02f9a40d1,
  title = {Drilling data in Wisconsin zinc-lead district},
  author = {J.W. Allingham},
  year = {1953},
  doi = {10.3133/ofr532},
  url = {https://pubs.usgs.gov/publication/ofr532},
  note = {Source identifier: ofr532}
}