scholarly journals Report on the U.S. Geological Survey's evaluation program for standard reference samples distributed in April 1994; T-129 (trace constituents), M-130 (major constituents), N-42 (nutrients), P-22 (low ionic strength), and Hg-18 (mercury)

1994 ◽  
Author(s):  
H. Keith Long ◽  
Jerry W. Farrar
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