@misc{indiciaec8d9b96d78aa,
  title = {Penicillin resistance in soil bacteria is an index of soil metal content near a porphyry copper deposit and near a concealed massive sulfide deposit},
  author = {J.R. Watterson and L.A. Nagy and D.M. Updegraff},
  year = {1984},
  doi = {10.3133/ofr8416},
  url = {https://pubs.usgs.gov/publication/ofr8416},
  note = {Source identifier: ofr8416}
}