@misc{indiciaeaf301c1d5701,
  title = {Geologic map of Precambrian rocks, southern Lake Superior region, Wisconsin and northern Michigan},
  author = {P. K. Sims},
  year = {1992},
  doi = {10.3133/i2185},
  url = {https://pubs.usgs.gov/publication/i2185},
  note = {Source identifier: i2185}
}