@misc{indiciae16ea6b07efb7,
  title = {Geologic map of the Republic quadrangle, Michigan},
  author = {William F. Cannon},
  year = {1971},
  doi = {10.3133/ofr7163},
  url = {https://pubs.usgs.gov/publication/ofr7163},
  note = {Source identifier: ofr7163}
}