@misc{indiciae3c752163f2cf,
  title = {Preliminary geologic map of Precambrian rocks in part of northern Wisconsin},
  author = {P. K. Sims and W.F. Cannon and M.G. Mudrey},
  year = {1978},
  doi = {10.3133/ofr78318},
  url = {https://pubs.usgs.gov/publication/ofr78318},
  note = {Source identifier: ofr78318}
}