@misc{indiciaee158f4e5c062,
  title = {Report on the U.S. Geological Survey's Evaluation Program Standard Reference Samples Distributed in October 1995: T-137 (Trace Constituents), M-136 (Major Constituents), N-47 (Nutrient Constituents), N-48 (Nutrient Constituents), P-25 (Low Ionic Strength Constituents), and Hg-21 (Mercury)},
  author = {Jerry W. Farrar and H. Keith Long},
  year = {1996},
  doi = {10.3133/ofr96138},
  url = {https://pubs.usgs.gov/publication/ofr96138},
  note = {Source identifier: ofr96138}
}