@misc{indiciaed1ad0c65cb55,
  title = {Results of the U.S. Geological Survey's analytical evaluation program for standard reference samples : T-151(trace constituents), M-144 (major constituents), N-55 (nutrient constituents), N-56 (nutrient constituents), P-29 (low ionic strength constituents), GWT-2 (ground-water trace constituents), GWM-2 (ground-water major constituents), AMW-4 (acid mine water constituents), and Hg-25 (mercury) distributed in September 1997},
  author = {J.W. Farrar},
  year = {1998},
  doi = {10.3133/ofr9852},
  url = {https://pubs.usgs.gov/publication/ofr9852},
  note = {Source identifier: ofr9852}
}