@misc{indiciae8d51423dcebf,
  title = {Geologic investigation of the Boyertown magnetite deposits in Pennsylvania},
  author = {H. E. Hawkes and Helmuth Wedow and James R. Balsley},
  year = {1953},
  doi = {10.3133/b995d},
  url = {https://pubs.usgs.gov/publication/b995D},
  note = {Source identifier: b995D}
}