@misc{indiciae455c7a6d53ad,
  title = {Topographic map of the Nankoweap Rapids area, Marble Canyon, Arizona},
  author = {Richard Hereford and K. S. Thompson},
  year = {1994},
  doi = {10.3133/ofr94564},
  url = {https://pubs.usgs.gov/publication/ofr94564},
  note = {Source identifier: ofr94564}
}