@misc{indiciaee02ee40274c3,
  title = {Results of the U.S. Geological Survey's analytical evaluation program for standard reference samples : T-147 (trace constituents), T-149 (trace constituents), M-142 (major constituents), N-53 (nutrient constituents), N-54 (nutrient constituents), P-28 (low ionic strength constituents) GW-1 (ground-water constituents), and Hg-24 (mercury) distributed in April 1997},
  author = {J.W. Farrar},
  year = {1997},
  doi = {10.3133/ofr97553},
  url = {https://pubs.usgs.gov/publication/ofr97553},
  note = {Source identifier: ofr97553}
}