scholarly journals Report on the U.S. Geological Survey's evaluation program for standard reference samples distributed in April 1996 : T-139 (trace constituents), T-141 (trace constituents), M-138 (trace constituents), N-49 (nutrient constituents), N-50 (nutrient constituents), P-26 (low ionic strength constituents) and Hg-22 (Mercury)

1996 ◽  
Author(s):  
J.W. Farrar ◽  
H.K. Long
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