@misc{indiciae9bb4962fdf70,
  title = {Report on the U.S. Geological Survey's evaluation program for standard reference samples distributed in April 1994; T-129 (trace constituents), M-130 (major constituents), N-42 (nutrients), P-22 (low ionic strength), and Hg-18 (mercury)},
  author = {H. Keith Long and Jerry W. Farrar},
  year = {1994},
  doi = {10.3133/ofr94369},
  url = {https://pubs.usgs.gov/publication/ofr94369},
  note = {Source identifier: ofr94369}
}