@misc{indiciaefb121cd1c197,
  title = {Reports and maps of the Geological Survey released only in the open files, 1957},
  author = {Betsy Anne Weld and Erwin S. Asselstine and Arthur Johnson},
  year = {1958},
  doi = {10.3133/cir403},
  url = {https://pubs.usgs.gov/publication/cir403},
  note = {Source identifier: cir403}
}