scholarly journals Report on the U.S. Geological Survey's evaluation program for standard reference samples distributed in October 1992, T-121 (trace constituents), M-124 (major constituents), N-36 (nutrients), N-37 (nutrients), P-19 (low ionic strength) and Hg-15 (mercury)

1993 ◽  
Author(s):  
H.K. Long ◽  
J.W. Farrar
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