@misc{indiciae15da8d1af0f1,
  title = {Preliminary geologic map of the southern part of the Champion 7 1/2-minute quadrangle, Marquette County, Michigan},
  author = {William F. Cannon and J. S. Klasner},
  year = {1975},
  doi = {10.3133/ofr7510},
  url = {https://pubs.usgs.gov/publication/ofr7510},
  note = {Source identifier: ofr7510}
}