@misc{indiciaeaa14ebdc0e63,
  title = {Notes on Isotopic Lead.},
  author = {F W Clarke},
  year = {1918},
  doi = {10.1073/pnas.4.6.181},
  url = {https://pubmed.ncbi.nlm.nih.gov/16576295/},
  note = {Source identifier: 16576295}
}