@misc{indiciae78adee0a4f93,
  title = {Fifty-seventh annual report of the Director of the Geological Survey},
  author = {Walter Curran Mendenhall},
  year = {1936},
  doi = {10.3133/ar57},
  url = {https://pubs.usgs.gov/publication/ar57},
  note = {Source identifier: ar57}
}