@misc{indiciae0151e14e8d94,
  title = {Isopach mapping by photogeologic methods as an aid in the location of swales and channels in the Monument Valley area, Arizona},
  author = {Irving Jerome Witkind and William R. Hemphill and Charles L. Pillmore and Robert H. Morris},
  year = {1953},
  doi = {10.3133/tei431},
  url = {https://pubs.usgs.gov/publication/tei431},
  note = {Source identifier: tei431}
}