@misc{indiciaeef32c6c27654,
  title = {Reports and maps of the Geological Survey released only in the open files, 1971},
  author = {Betsy A. Weld and Kathleen T. Iseri and George W. Brett},
  year = {1972},
  doi = {10.3133/cir648},
  url = {https://pubs.usgs.gov/publication/cir648},
  note = {Source identifier: cir648}
}