@misc{indiciaef58b41bdb4db,
  title = {Reports and maps of the Geological Survey released only in the open files, 1949-1950},
  author = {Anna Jesperson and Lois E. Randall and Robert E. Spratt},
  year = {1952},
  doi = {10.3133/cir149},
  url = {https://pubs.usgs.gov/publication/cir149},
  note = {Source identifier: cir149}
}