TY  - RPRT
TI  - Results of the U.S. Geological Survey's analytical evaluation program for standard reference samples : T-151(trace constituents), M-144 (major constituents), N-55 (nutrient constituents), N-56 (nutrient constituents), P-29 (low ionic strength constituents), GWT-2 (ground-water trace constituents), GWM-2 (ground-water major constituents), AMW-4 (acid mine water constituents), and Hg-25 (mercury) distributed in September 1997
AU  - J.W. Farrar
PY  - 1998
DO  - 10.3133/ofr9852
UR  - https://pubs.usgs.gov/publication/ofr9852
ID  - ofr9852
ER  -