@misc{indiciae1c936c6bc471,
  title = {Bedrock geology of the Manitou Island quadrangle, Michigan},
  author = {Henry Rowland Cornwall and Walter S. White},
  year = {1955},
  doi = {10.3133/gq73},
  url = {https://pubs.usgs.gov/publication/gq73},
  note = {Source identifier: gq73}
}