@misc{indiciaece00a0e4478a,
  title = {Report on the U.S. Geological Survey's evaluation program for standard reference samples distributed in October 1994 : T-131 (trace constituents), T-133 (trace constituents), M-132 (major constituents), N-43 (nutrients), N-44 (nutrients), P-23 (low ionic strength) and Hg-19 (mercury)},
  author = {H. Keith Long and Jerry W. Farrar},
  year = {1995},
  doi = {10.3133/ofr95117},
  url = {https://pubs.usgs.gov/publication/ofr95117},
  note = {Source identifier: ofr95117}
}