scholarly journals Report on the U.S. Geological Survey's evaluation program for standard reference samples distributed in September 1996 : T-143 (trace constituents), T-145 (trace constituents), M-140 (major constituents), N-51 (nutrient constituents), N-52 (nutrient constituents), P-27 (low ionic strength constituents), and Hg-23 (mercury)

1997 ◽  
Author(s):  
J.W. Farrar ◽  
H.K. Long
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