@misc{indiciaebb8ae3625995,
  title = {Report on the U.S. Geological Survey's evaluation program for standard reference samples distributed in May 1995 : T-135 (trace constituents), M-134 (major constituents), N-45 (nutrients), N-46 (nutrients), P-24 (low ionic strength), Hg-20 (mercury), and SED-5 (bed material)},
  author = {H.K. Long and J.W. Farrar},
  year = {1995},
  doi = {10.3133/ofr95395},
  url = {https://pubs.usgs.gov/publication/ofr95395},
  note = {Source identifier: ofr95395}
}