@misc{indiciaec9e5160f2118,
  title = {Fifty-fifth annual report of the Director of the Geological Survey},
  author = {Walter Curran Mendenhall},
  year = {1934},
  doi = {10.3133/ar55},
  url = {https://pubs.usgs.gov/publication/ar55},
  note = {Source identifier: ar55}
}