@misc{indiciae5d41149c1b3e,
  title = {Bedrock geology of the Delaware quadrangle, Michigan},
  author = {Henry Rowland Cornwall},
  year = {1954},
  doi = {10.3133/gq51},
  url = {https://pubs.usgs.gov/publication/gq51},
  note = {Source identifier: gq51}
}