@misc{indiciae6fa13e2e1325,
  title = {Preliminary geologic map of the Negaunee SW quadrangle, Michigan},
  author = {Lorin D. Clark},
  year = {1973},
  doi = {10.3133/ofr7346},
  url = {https://pubs.usgs.gov/publication/ofr7346},
  note = {Source identifier: ofr7346}
}