TY  - RPRT
TI  - Report on the U.S. Geological Survey's Evaluation Program Standard Reference Samples Distributed in October 1995: T-137 (Trace Constituents), M-136 (Major Constituents), N-47 (Nutrient Constituents), N-48 (Nutrient Constituents), P-25 (Low Ionic Strength Constituents), and Hg-21 (Mercury)
AU  - Jerry W. Farrar
AU  - H. Keith Long
PY  - 1996
DO  - 10.3133/ofr96138
UR  - https://pubs.usgs.gov/publication/ofr96138
ID  - ofr96138
ER  -