@misc{indiciae597fa7461c2b,
  title = {Report on the U.S. Geological Survey's evaluation program for standard reference samples distributed in October 1993 : T-127 (trace constituents), M-128 (major constituents), N-40 (nutrients), N-41 (nutrients), P-21 (low ionic strength), Hg-17 (mercury), AMW-3 (acid mine water), and WW-1 (whole water)},
  author = {H.K. Long and J.W. Farrar},
  year = {1994},
  doi = {10.3133/ofr9442},
  url = {https://pubs.usgs.gov/publication/ofr9442},
  note = {Source identifier: ofr9442}
}