@misc{indiciaeb7e56c802765,
  title = {Fifty-third annual report of the Director of the Geological Survey},
  author = {Walter Curran Mendenhall},
  year = {1932},
  doi = {10.3133/ar53},
  url = {https://pubs.usgs.gov/publication/ar53},
  note = {Source identifier: ar53}
}