@misc{indiciaed40504fd44ac,
  title = {Geologic maps showing outcrops of the Nonesuch shale from Calumet to Black River, Michigan},
  author = {Walter S. White and James C. Wright},
  year = {1962},
  doi = {10.3133/ofr62157},
  url = {https://pubs.usgs.gov/publication/ofr62157},
  note = {Source identifier: ofr62157}
}