@misc{indiciae228f364db85f,
  title = {Topographic map of the Granite Park area, Grand Canyon, Arizona},
  author = {Richard Hereford and K. S. Thompson},
  year = {1994},
  doi = {10.3133/ofr94563},
  url = {https://pubs.usgs.gov/publication/ofr94563},
  note = {Source identifier: ofr94563}
}