@misc{indiciae431bcc999c85,
  title = {Tables for the calculation of lead isotope ages},
  author = {L. R. Stieff and T. W. Stern and Seiki Oshiro and F. E. Senftle},
  year = {1959},
  doi = {10.3133/pp334a},
  url = {https://pubs.usgs.gov/publication/pp334A},
  note = {Source identifier: pp334A}
}