@misc{indiciae25ff80b86bef,
  title = {Isometric diagram of the International No. 4 mine, Edwards township, St. Lawrence County, New York},
  author = {A.E.J. Engel and K. Stefansson},
  year = {1945},
  doi = {10.3133/ofr4593},
  url = {https://pubs.usgs.gov/publication/ofr4593},
  note = {Source identifier: ofr4593}
}