@misc{indiciae8a0c12455396,
  title = {Reports and maps of the Geological Survey released only in the open files, 1967},
  author = {Betsy A. Weld and Margaret S. Griffin and George W. Brett},
  year = {1968},
  doi = {10.3133/cir548},
  url = {https://pubs.usgs.gov/publication/cir548},
  note = {Source identifier: cir548}
}