@misc{indiciae84d65e06be80,
  title = {Stratified rocks of the Grand Canyon: Chapter B in The Colorado River region and John Wesley Powell (Professional Paper 669)},
  author = {Edwin D. McKee},
  year = {1969},
  doi = {10.3133/pp669b},
  url = {https://pubs.usgs.gov/publication/pp669B},
  note = {Source identifier: pp669B}
}