@misc{indiciaee5f4e5c28ee9,
  title = {Geologic map of the SE 1/4 Mount Union quadrangle, Yavapai County, Arizona},
  author = {Philip M. Blacet},
  year = {1968},
  doi = {10.3133/ofr6812},
  url = {https://pubs.usgs.gov/publication/ofr6812},
  note = {Source identifier: ofr6812}
}