@misc{indiciae315d44a2707b,
  title = {Bibliography of North American geology, 1931 and 1932},
  author = {John M. Nickles},
  year = {1934},
  doi = {10.3133/b858},
  url = {https://pubs.usgs.gov/publication/b858},
  note = {Source identifier: b858}
}