@misc{indiciaeb2549c22d0d2,
  title = {Geology in relation to availability of water along the south rim, Grand Canyon National Park, Arizona},
  author = {Donald George Metzger},
  year = {1961},
  doi = {10.3133/wsp1475c},
  url = {https://pubs.usgs.gov/publication/wsp1475C},
  note = {Source identifier: wsp1475C}
}