@misc{indiciaed18fb7008657,
  title = {Geology and ore deposits of the Monument Valley area, Apache and Navajo Counties, Arizona},
  author = {Irving Jerome Witkind},
  year = {1956},
  doi = {10.3133/ofr57124},
  url = {https://pubs.usgs.gov/publication/ofr57124},
  note = {Source identifier: ofr57124}
}