@misc{indiciaec3de546c3970,
  title = {Structure map of Archean Rocks, Palmer and Sands 7 1/2-minute quadrangles, Michigan, showing Great Lakes tectonic zone},
  author = {P.K. Sims},
  year = {1993},
  doi = {10.3133/i2355},
  url = {https://pubs.usgs.gov/publication/i2355},
  note = {Source identifier: i2355}
}