TY  - RPRT
TI  - Results of the U.S. Geological Survey's analytical evaluation program for standard reference samples : T-147 (trace constituents), T-149 (trace constituents), M-142 (major constituents), N-53 (nutrient constituents), N-54 (nutrient constituents), P-28 (low ionic strength constituents) GW-1 (ground-water constituents), and Hg-24 (mercury) distributed in April 1997
AU  - J.W. Farrar
PY  - 1997
DO  - 10.3133/ofr97553
UR  - https://pubs.usgs.gov/publication/ofr97553
ID  - ofr97553
ER  -