Report on the U.S. Geological Survey's evaluation program for standard reference samples distributed in October 1994 [microform] : 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) / by H. Keith Long and Jerry W. Farrar

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