@misc{indiciae366d9a36bc11,
  title = {Geology and mineral resources of the Bellefonte quadrangle, Pennsylvania},
  author = {Charles Butts and Elwood S. Moore},
  year = {1936},
  doi = {10.3133/b855},
  url = {https://pubs.usgs.gov/publication/b855},
  note = {Source identifier: b855}
}