@misc{indiciaef40312f324cf,
  title = {The correlation of the Upper Cambrian sections of Missouri and Texas with the section in the upper Mississippi Valley},
  author = {Josiah Bridge},
  year = {1937},
  doi = {10.3133/pp186l},
  url = {https://pubs.usgs.gov/publication/pp186L},
  note = {Source identifier: pp186L}
}