@misc{indiciae4423fbc8182e,
  title = {The isotopic composition of lead in potassium feldspars from some 1.0-b.y. old North American igneous rocks},
  author = {R. E. Zartman and G.J. Wasserburg},
  year = {1969},
  doi = {10.1016/0016-7037(69)90104-5},
  url = {https://pubs.usgs.gov/publication/70011675},
  note = {Source identifier: 70011675}
}