@article{240766,
      note = {Chiefly tables.},
      author = {Long, H. Keith. and Farrar, Jerry W.},
      url = {http://library.usi.edu/record/240766},
      title = {Report on the U.S. Geological Survey's evaluation program  for standard reference samples distributed in April 1993  T-123 (trace constituents), T-125 (trace constituents),  M-126 (major constituents), N-38 (nutrients), N-39  (nutrients), P-20 (low ionic strength), and Hg-16 (mercury)  / [microform] :},
      publisher = {U.S. Geological Survey ;},
      recid = {240766},
      pages = {iii, 149 p. :},
      address = {Golden, Colo. :},
      year = {1993},
}