@misc{indiciaeac7fc0f08de8,
  title = {Reconnaissance geologic map of the Simmons quadrangle, Yavapai County, Arizona},
  author = {M. H. Krieger},
  year = {1967},
  doi = {10.3133/i503},
  url = {https://pubs.usgs.gov/publication/i503},
  note = {Source identifier: i503}
}