TY  - RPRT
TI  - Stability of nitrate-ion concentrations in simulated deposition samples used for quality-assurance activities by the U.S. Geological Survey
AU  - T. C. Willoughby
AU  - R.B. See
AU  - L.J. Schroder
PY  - 1989
DO  - 10.3133/wri894042
UR  - https://pubs.usgs.gov/publication/wri894042
ID  - wri894042
ER  -