Report on the U.S. Geological Survey's evaluation program for standard reference samples distributed in May 1995 [microform] : T-135 (trace constituents), M-134 (major constituents), N-45 (nutrients), N-46 (nutrients), P-24 (low ionic strength), Hg-20 (mercury), and SED-5 (bed material) / by H. Keith Long and Jerry W. Farrar

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