@misc{indiciae9e6a82c9012c,
  title = {Hollidaysburg-Huntingdon folio, Pennsylvania},
  author = {Charles Butts},
  year = {1945},
  doi = {10.3133/gf227},
  url = {https://pubs.usgs.gov/publication/gf227},
  note = {Source identifier: gf227}
}