@misc{indiciae8c09e8705e6b,
  title = {Spectrographic detection limits of the noble metals},
  author = {Anthony Francis Dorrzapf},
  year = {1967},
  doi = {10.3133/ofr6783},
  url = {https://pubs.usgs.gov/publication/ofr6783},
  note = {Source identifier: ofr6783}
}