@misc{indiciaec70573c4d1a0,
  title = {Some lead-zinc and zinc-copper deposits of the Ketchikan and Wales districts, Alaska},
  author = {G. D. Robinson and William Stephens Twenhofel},
  year = {1953},
  doi = {10.3133/b998c},
  url = {https://pubs.usgs.gov/publication/b998C},
  note = {Source identifier: b998C}
}