@misc{indiciae787ea71f0f08,
  title = {Lead isotope guides for Mississippi Valley lead-zinc exploration},
  author = {Ralph Smyser Cannon and Arthur P. Pierce},
  year = {1969},
  doi = {10.3133/b1312g},
  url = {https://pubs.usgs.gov/publication/b1312G},
  note = {Source identifier: b1312G}
}