@misc{indiciaeaa00043a9c80,
  title = {Lead-isotopic characteristics of the Cracow-Silesia Zn-Pb ores, southern Poland},
  author = {S. E. Church and R. B. Vaughn},
  year = {1992},
  doi = {10.3133/ofr92393},
  url = {https://pubs.usgs.gov/publication/ofr92393},
  note = {Source identifier: ofr92393}
}