@misc{indiciae683b14ef18d5,
  title = {Reports and maps of the Geological Survey released only in the open files, 1960},
  author = {Betsy A. Weld and Erwin S. Asselstine and Arthur Johnson},
  year = {1961},
  doi = {10.3133/cir448},
  url = {https://pubs.usgs.gov/publication/cir448},
  note = {Source identifier: cir448}
}