@misc{indiciae087f2463270b,
  title = {Mineral resources of Johnstown, Pennsylvania and vicinity},
  author = {William Clifton Phalen and Lawrence Martin},
  year = {1911},
  doi = {10.3133/b447},
  url = {https://pubs.usgs.gov/publication/b447},
  note = {Source identifier: b447}
}