@misc{indiciaefc654e08be29,
  title = {Geology of the Paleozoic rocks, Navajo and Hopi Indian Reservations, Arizona, New Mexico, and Utah},
  author = {J. H. Irwin and P. R. Stevens and M. E. Cooley},
  year = {1971},
  doi = {10.3133/pp521c},
  url = {https://pubs.usgs.gov/publication/pp521C},
  note = {Source identifier: pp521C}
}