@misc{indiciae4993737a8c97,
  title = {Geochemical prospecting for zinc, lead, copper, and silver, Lancaster Valley, southeastern Pennsylvania},
  author = {Jacob Freedman},
  year = {1972},
  doi = {10.3133/b1314c},
  url = {https://pubs.usgs.gov/publication/b1314C},
  note = {Source identifier: b1314C}
}