@misc{indiciaec6c66ff07838,
  title = {A list of references on lead isotope geochemistry through 1966},
  author = {Bruce R. Doe},
  year = {1968},
  doi = {10.3133/ofr6876},
  url = {https://pubs.usgs.gov/publication/ofr6876},
  note = {Source identifier: ofr6876}
}