@misc{indiciae4ecea634fc98,
  title = {Fifty-fourth annual report of the Director of the Geological Survey},
  author = {Walter Curran Mendenhall},
  year = {1933},
  doi = {10.3133/ar54},
  url = {https://pubs.usgs.gov/publication/ar54},
  note = {Source identifier: ar54}
}