@misc{indiciaeb72631ffd0ed,
  title = {Archean and Proterozoic geology of the Lake Superior region, U.S.A., 1993},
  author = {P.K. Sims and L. M. H. Carter},
  year = {1996},
  doi = {10.3133/pp1556},
  url = {https://pubs.usgs.gov/publication/pp1556},
  note = {Source identifier: pp1556}
}