@misc{indiciae2ee11ca0b144,
  title = {Geologic map of Precambrian rocks of Iron Mountain and Escanaba 1 x 2 quadrangles, northeastern Wisconsin and northwestern Michigan},
  author = {P.K. Sims},
  year = {1990},
  doi = {10.3133/i2056},
  url = {https://pubs.usgs.gov/publication/i2056},
  note = {Source identifier: i2056}
}