@misc{indiciae962afbfa49dc,
  title = {Changes in sample collection and analytical techniques and effects on retrospective comparability of low-level concentrations of trace elements in ground water},
  author = {T. Ivahnenko and Z. Szabo and J. Gibs},
  year = {2001},
  doi = {10.1016/s0043-1354(01)00094-x},
  url = {https://pubs.usgs.gov/publication/70023765},
  note = {Source identifier: 70023765}
}