@misc{indiciae8e04889cfbc1,
  title = {Reports and maps of the Geological Survey released only in the open files, 1956},
  author = {Betsy Anne Weld and William Stewart Eisenlohr and Arthur Johnson},
  year = {1957},
  doi = {10.3133/cir401},
  url = {https://pubs.usgs.gov/publication/cir401},
  note = {Source identifier: cir401}
}