@misc{indiciae6c50256b2524,
  title = {Preliminary map of the Precambrian geology of the south half of the Vulcan quadrangle, Dickinson County, Michigan},
  author = {Richard W. Bayley},
  year = {1957},
  doi = {10.3133/ofr5710},
  url = {https://pubs.usgs.gov/publication/ofr5710},
  note = {Source identifier: ofr5710}
}