@misc{indiciae91aec9a7b53e,
  title = {The chemical work of the U. S. Geological Survey},
  author = {F. W. Clarke},
  year = {1909},
  doi = {10.1126/science.30.762.161},
  url = {https://pubs.usgs.gov/publication/70011082},
  note = {Source identifier: 70011082}
}